Merge pull request #23660 from goltermann/vetclean

Automatic merge from submit-queue

Additional go vet fixes

Mostly:
- pass lock by value
- bad syntax for struct tag value
- example functions not formatted properly

pkg/master/master_test.go

@@ -56,10 +56,10 @@ import (
 )
 
 // setUp is a convience function for setting up for (most) tests.
-func setUp(t *testing.T) (Master, *etcdtesting.EtcdTestServer, Config, *assert.Assertions) {
+func setUp(t *testing.T) (*Master, *etcdtesting.EtcdTestServer, Config, *assert.Assertions) {
 	server := etcdtesting.NewEtcdTestClientServer(t)
 
-	master := Master{
+	master := &Master{
 		GenericAPIServer: &genericapiserver.GenericAPIServer{},
 	}
 	config := Config{