Reduce config a bit

Author: markusthoemmes

.golangci.yaml

@@ -1,21 +1,6 @@
 run:
   timeout: 5m
 
-  build-tags:
-    - e2e
-    - performance
-    - probe
-    - preupgrade
-    - postupgrade
-    - postdowngrade
-    - istio
-
-  skip-dirs:
-    - pkg/client
-
-  skip-files:
-    - ".pb.go$"
-
 linters:
   enable:
     - asciicheck
@@ -32,10 +17,3 @@ issues:
     - path: test # Excludes /test, *_test.go etc.
       linters:
         - gosec
-        - unparam
-
-    # Allow source and sink receivers in conversion code for clarity.
-    - path: _conversion\.go
-      text: "ST1016:"
-      linters:
-        - stylecheck