Fix helm hooks doesn't work in oaisim with Helm 2.15

Also use helper for reducing duplicate code lines for service account
and resource labels.

Change-Id: I2987d1f5fc9ac961da9adf858b36fb9828154210
diff --git a/oaisim/templates/configmap-ue.yaml b/oaisim/templates/configmap-ue.yaml
index 6476f7d..60b6b09 100644
--- a/oaisim/templates/configmap-ue.yaml
+++ b/oaisim/templates/configmap-ue.yaml
@@ -19,7 +19,9 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: {{ .Values.config.ue.name }}
+  name: ue
+  labels:
+{{ tuple "ue" . | include "oaisim.metadata_labels" | indent 4 }}
 data:
   ue_comac_test.conf: |
     PLMN: {