Remove dependency on io/ioutil module

This fixes lint errors generated in CI after upgrading
go version into 1.19.6.

Signed-off-by: Periyasamy Palanisamy <[email protected]>

Author: pperiyasamy

cache/doc.go

@@ -3,7 +3,7 @@ Package cache provides a cache of model.Model elements that can be used in an OV
 
 The cache can be accessed using a simple API:
 
-    cache.Table("Open_vSwitch").Row("<ovs-uuid>")
+	cache.Table("Open_vSwitch").Row("<ovs-uuid>")
 
 It implements the ovsdb.NotificationHandler interface
 such that it can be populated automatically by

cmd/modelgen/main.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
@@ -56,7 +56,7 @@ func main() {
 	}
 	defer schemaFile.Close()
 
-	schemaBytes, err := ioutil.ReadAll(schemaFile)
+	schemaBytes, err := io.ReadAll(schemaFile)
 	if err != nil {
 		log.Fatal(err)
 	}

cmd/print_schema/print_schema.go

@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"runtime"
@@ -53,7 +53,7 @@ func main() {
 	}
 	defer schemaFile.Close()
 
-	schemaBytes, err := ioutil.ReadAll(schemaFile)
+	schemaBytes, err := io.ReadAll(schemaFile)
 	if err != nil {
 		log.Fatal(err)
 	}

mapper/mapper.go

@@ -12,12 +12,14 @@ import (
 // to what column in the database id through field a field tag.
 // The tag used is "ovsdb" and has the following structure
 // 'ovsdb:"${COLUMN_NAME}"'
+//
 //	where COLUMN_NAME is the name of the column and must match the schema
 //
-//Example:
-//  type MyObj struct {
-//  	Name string `ovsdb:"name"`
-//  }
+// Example:
+//
+//	type MyObj struct {
+//		Name string `ovsdb:"name"`
+//	}
 type Mapper struct {
 	Schema ovsdb.DatabaseSchema
 }

model/model.go

@@ -16,12 +16,13 @@ import (
 // The struct may also have non-tagged fields (which will be ignored by the API calls)
 // The Model interface must be implemented by the pointer to such type
 // Example:
-//type MyLogicalRouter struct {
-//	UUID          string            `ovsdb:"_uuid"`
-//	Name          string            `ovsdb:"name"`
-//	ExternalIDs   map[string]string `ovsdb:"external_ids"`
-//	LoadBalancers []string          `ovsdb:"load_balancer"`
-//}
+//
+//	type MyLogicalRouter struct {
+//		UUID          string            `ovsdb:"_uuid"`
+//		Name          string            `ovsdb:"name"`
+//		ExternalIDs   map[string]string `ovsdb:"external_ids"`
+//		LoadBalancers []string          `ovsdb:"load_balancer"`
+//	}
 type Model interface{}
 
 type CloneableModel interface {

modelgen/generator.go

@@ -4,8 +4,8 @@ import (
 	"bytes"
 	"fmt"
 	"go/format"
-	"io/ioutil"
 	"log"
+	"os"
 	"text/template"
 )
 
@@ -47,11 +47,11 @@ func (g *generator) Generate(filename string, tmpl *template.Template, args inte
 		fmt.Print("\n")
 		return nil
 	}
-	content, err := ioutil.ReadFile(filename)
+	content, err := os.ReadFile(filename)
 	if err == nil && bytes.Equal(content, src) {
 		return nil
 	}
-	return ioutil.WriteFile(filename, src, 0644)
+	return os.WriteFile(filename, src, 0644)
 }
 
 // NewGenerator returns a new Generator

ovsdb/schema.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"os"
 	"strings"
@@ -48,7 +47,7 @@ func (schema DatabaseSchema) Print(w io.Writer) {
 
 // SchemaFromFile returns a DatabaseSchema from a file
 func SchemaFromFile(f *os.File) (DatabaseSchema, error) {
-	data, err := ioutil.ReadAll(f)
+	data, err := io.ReadAll(f)
 	if err != nil {
 		return DatabaseSchema{}, err
 	}
@@ -124,7 +123,7 @@ of this library, we define an ExtendedType that includes all possible column typ
 atomic fields).
 */
 
-//ExtendedType includes atomic types as defined in the RFC plus Enum, Map and Set
+// ExtendedType includes atomic types as defined in the RFC plus Enum, Map and Set
 type ExtendedType = string
 
 // RefType is used to define the possible RefTypes