Relabel controler-manager to kube-controller-manager (#1830)

Fixes #1129

roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2

@@ -4,7 +4,7 @@ metadata:
   name: kube-controller-manager
   namespace: {{system_namespace}}
   labels:
-    k8s-app: kube-controller
+    k8s-app: kube-controller-manager
   annotations:
     kubespray.etcd-cert/serial: "{{ etcd_client_cert_serial }}"
     kubespray.controller-manager-cert/serial: "{{ controller_manager_cert_serial }}"