Helm 3 compatibility

Change-Id: I16338180c5cfbf5218c51dff21ebe04090396919
diff --git a/oaisim/templates/statefulset-enb.yaml b/oaisim/templates/statefulset-enb.yaml
index b96a809..c910685 100644
--- a/oaisim/templates/statefulset-enb.yaml
+++ b/oaisim/templates/statefulset-enb.yaml
@@ -24,6 +24,7 @@
 {{ tuple "enb" . | include "oaisim.metadata_labels" | indent 4 }}
 spec:
   replicas: 1
+  serviceName: oaisim-enb
   selector:
     matchLabels:
 {{ tuple "enb" . | include "oaisim.metadata_labels" | indent 6 }}