[COMMON] Add missing labels for etcd, mongo, postgres

Add labels for DB deployments to be compliant with Istio
and kiali requirements

Issue-ID: OOM-3230

Change-Id: I937d9f326dae8e2c2496eace2e919aa0b8eb0171
Signed-off-by: Andreas Geissler <andreas-geissler@telekom.de>
diff --git a/kubernetes/common/etcd/templates/service.yaml b/kubernetes/common/etcd/templates/service.yaml
index 1199b22..006378f 100644
--- a/kubernetes/common/etcd/templates/service.yaml
+++ b/kubernetes/common/etcd/templates/service.yaml
@@ -33,6 +33,6 @@
     port: {{ .Values.service.clientInternalPort }}
   clusterIP: None
   selector:
-    app: {{ include "common.name" . }}
-    release: "{{ include "common.release" . }}"
+    app.kubernetes.io/name: {{ include "common.name" . }}
+    app.kubernetes.io/instance: {{ include "common.release" . }}