VOL-3139 - add name helper template

- includes the {{ .Release.Name }} be default
- can be overriden with
  - nameOverride: override the {{ .Release.Name }}-{{ .Chart.Name }}
    porition
  - fullNameOverride: override everything

Change-Id: I0e1dbccba8f1e484e13e6f9ae43ea35ce97aac4f
diff --git a/voltha/templates/api-svc.yaml b/voltha/templates/api-svc.yaml
index 1804875..7edc0ea 100644
--- a/voltha/templates/api-svc.yaml
+++ b/voltha/templates/api-svc.yaml
@@ -15,7 +15,7 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: voltha-api
+  name: "{{ template "fullname" . }}-api"
   namespace: "{{ .Release.Namespace }}"
 spec:
   ports: