fix(api): make LocalObjectReference.Name and HostAlias.IP required (kubernetes#124553)

* fix(api): LocalObjectReference Name a "" default and make HostAlias.IP required

* chore(api): add LocalObjectReference comment

* chore(api): add omitempty to LocalObjectReference's Name

* chore(api): add kubebuilder:default annotation

* chore(api): ./hack/update-codegen.sh

Author: pmalek

api/openapi-spec/swagger.json

@@ -955,7 +955,8 @@
         "description": "ConfigMapEnvSource selects a ConfigMap to populate the environment variables with.\n\nThe contents of the target ConfigMap's Data field will represent the key-value pairs as environment variables.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -974,7 +975,8 @@
             "type": "string"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -1084,7 +1086,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -1116,7 +1119,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -2784,10 +2788,14 @@
             "x-kubernetes-list-type": "atomic"
           },
           "ip": {
+            "default": "",
             "description": "IP address of the host file entry.",
             "type": "string"
           }
         },
+        "required": [
+          "ip"
+        ],
         "type": "object"
       },
       "io.k8s.api.core.v1.HostIP": {
@@ -3248,7 +3256,8 @@
         "description": "LocalObjectReference contains enough information to let you locate the referenced object inside the same namespace.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           }
         },
@@ -6934,7 +6943,8 @@
         "description": "SecretEnvSource selects a Secret to populate the environment variables with.\n\nThe contents of the target Secret's Data field will represent the key-value pairs as environment variables.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -6953,7 +6963,8 @@
             "type": "string"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -7029,7 +7040,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {

api/openapi-spec/v3/api__v1_openapi.json

@@ -1663,7 +1663,8 @@
         "description": "ConfigMapEnvSource selects a ConfigMap to populate the environment variables with.\n\nThe contents of the target ConfigMap's Data field will represent the key-value pairs as environment variables.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -1682,7 +1683,8 @@
             "type": "string"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -1713,7 +1715,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -1745,7 +1748,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -2715,10 +2719,14 @@
             "x-kubernetes-list-type": "atomic"
           },
           "ip": {
+            "default": "",
             "description": "IP address of the host file entry.",
             "type": "string"
           }
         },
+        "required": [
+          "ip"
+        ],
         "type": "object"
       },
       "io.k8s.api.core.v1.HostPathVolumeSource": {
@@ -2896,7 +2904,8 @@
         "description": "LocalObjectReference contains enough information to let you locate the referenced object inside the same namespace.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           }
         },
@@ -4459,7 +4468,8 @@
         "description": "SecretEnvSource selects a Secret to populate the environment variables with.\n\nThe contents of the target Secret's Data field will represent the key-value pairs as environment variables.",
         "properties": {
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -4478,7 +4488,8 @@
             "type": "string"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {
@@ -4509,7 +4520,8 @@
             "x-kubernetes-list-type": "atomic"
           },
           "name": {
-            "description": "Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
+            "default": "",
+            "description": "Name of the referent. This field is effectively required, but due to backwards compatibility is allowed to be empty. Instances of this type with an empty value here are almost certainly wrong. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names",
             "type": "string"
           },
           "optional": {