fix a few missed references

```
grep -RIl pkg/master . | xargs -n 1 sed -i 's|pkg/master|pkg/controlplane|g'
LC_ALL=C sort -o hack/.golint_failures hack/.golint_failures
```

Author: lavalamp

hack/.golint_failures

@@ -89,6 +89,8 @@ pkg/controller/volume/attachdetach/testing
 pkg/controller/volume/expand
 pkg/controller/volume/persistentvolume
 pkg/controller/volume/persistentvolume/config/v1alpha1
+pkg/controlplane/controller/crdregistration
+pkg/controlplane/tunneler
 pkg/features
 pkg/kubeapiserver
 pkg/kubectl/cmd/convert
@@ -109,8 +111,6 @@ pkg/kubelet/stats
 pkg/kubelet/sysctl
 pkg/kubelet/types
 pkg/kubemark
-pkg/master/controller/crdregistration
-pkg/master/tunneler
 pkg/proxy/apis/config
 pkg/proxy/apis/config/v1alpha1
 pkg/proxy/userspace

hack/verify-api-groups.sh

@@ -95,7 +95,7 @@ packages_without_install=(
 	"k8s.io/kubernetes/pkg/apis/componentconfig" # TODO: Remove this package completely and from this list
 )
 known_version_files=(
-	"pkg/master/import_known_versions.go"
+	"pkg/controlplane/import_known_versions.go"
 )
 for expected_install_package in "${expected_install_packages[@]}"; do
 	found=0

staging/src/k8s.io/apiserver/pkg/endpoints/request/requestinfo.go

@@ -77,7 +77,7 @@ var specialVerbsNoSubresources = sets.NewString("proxy")
 // this list allows the parser to distinguish between a namespace subresource, and a namespaced resource
 var namespaceSubresources = sets.NewString("status", "finalize")
 
-// NamespaceSubResourcesForTest exports namespaceSubresources for testing in pkg/master/master_test.go, so we never drift
+// NamespaceSubResourcesForTest exports namespaceSubresources for testing in pkg/controlplane/master_test.go, so we never drift
 var NamespaceSubResourcesForTest = sets.NewString(namespaceSubresources.List()...)
 
 type RequestInfoFactory struct {