client-go: don't import client auth provider packages

cmd/kubectl/app/kubectl.go

@@ -19,6 +19,7 @@ package app
 import (
 	"os"
 
+	_ "k8s.io/client-go/plugin/pkg/client/auth"         // kubectl auth providers.
 	_ "k8s.io/kubernetes/pkg/client/metrics/prometheus" // for client metric registration
 	"k8s.io/kubernetes/pkg/kubectl/cmd"
 	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"

cmd/libs/go2idl/client-gen/generators/generator_for_clientset.go

@@ -63,8 +63,6 @@ func (g *genClientset) Imports(c *generator.Context) (imports []string) {
 	}
 	imports = append(imports, "github.com/golang/glog")
 	imports = append(imports, "k8s.io/client-go/util/flowcontrol")
-	// import solely to initialize client auth plugins.
-	imports = append(imports, "_ \"k8s.io/client-go/plugin/pkg/client/auth\"")
 	return
 }
 

staging/src/k8s.io/client-go/discovery/helper.go

@@ -23,8 +23,6 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/sets"
 	apimachineryversion "k8s.io/apimachinery/pkg/version"
-	// Import solely to initialize client auth plugins.
-	_ "k8s.io/client-go/plugin/pkg/client/auth"
 )
 
 // MatchesServerVersion queries the server to compares the build version

staging/src/k8s.io/client-go/kubernetes/clientset.go

@@ -35,7 +35,6 @@ import (
 	v1alpha1rbac "k8s.io/client-go/kubernetes/typed/rbac/v1alpha1"
 	v1beta1rbac "k8s.io/client-go/kubernetes/typed/rbac/v1beta1"
 	v1beta1storage "k8s.io/client-go/kubernetes/typed/storage/v1beta1"
-	_ "k8s.io/client-go/plugin/pkg/client/auth"
 	rest "k8s.io/client-go/rest"
 	"k8s.io/client-go/util/flowcontrol"
 )