providerless tag for client-go auth plugins

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

hack/verify-typecheck-providerless.sh

@@ -35,3 +35,10 @@ if _out="$(go list -mod=readonly -tags "providerless" -e -json  k8s.io/kubernete
     echo "Verify typecheck for providerless tag failed. Found restricted packages." >&2
     exit 1
 fi
+if _out="$(go list -mod=readonly -tags "providerless" -e -json  k8s.io/kubernetes/cmd/kube-apiserver/... \
+  | grep -e Azure/azure-sdk-for-go -e github.com/aws/aws-sdk-go -e google.golang.org/api \
+         -e Azure/go-autorest -e oauth2/google)"; then
+    echo "${_out}" >&2
+    echo "Verify typecheck for providerless tag failed. Found restricted packages." >&2
+    exit 1
+fi