make the resource prefix in etcd configurable for cohabitation

pkg/master/master.go

@@ -731,6 +731,7 @@ func (m *Master) GetRESTOptionsOrDie(c *Config, resource unversioned.GroupResour
 		Storage:                 storage,
 		Decorator:               m.StorageDecorator(),
 		DeleteCollectionWorkers: m.deleteCollectionWorkers,
+		ResourcePrefix:          c.StorageFactory.ResourcePrefix(resource),
 	}
 }