patch master option tweaks

Author: juanvallejo

test/util/server/server.go

@@ -193,6 +193,10 @@ func DefaultMasterOptionsWithTweaks(startEtcd, useDefaultPort bool) (*configapi.
 		return nil, err
 	}
 
+	if masterConfig.AdmissionConfig.PluginConfig == nil {
+		masterConfig.AdmissionConfig.PluginConfig = make(map[string]configapi.AdmissionPluginConfig)
+	}
+
 	if masterConfig.EtcdConfig != nil {
 		addr, err := FindAvailableBindAddress(10000, 29999)
 		if err != nil {