VOL-1701 - modify existing open olt template to support either go or python impl

Change-Id: I6fc52bdd524c5684634a5b51ad69e5f922b696a7
diff --git a/voltha-adapter-openolt/values.yaml b/voltha-adapter-openolt/values.yaml
index 467d5d6..7610fa4 100644
--- a/voltha-adapter-openolt/values.yaml
+++ b/voltha-adapter-openolt/values.yaml
@@ -13,6 +13,8 @@
 # limitations under the License.
 
 ---
+use_go: false
+
 # Default overrides
 defaults:
   image_registry:
@@ -43,5 +45,6 @@
   adapter_open_olt:
     registry: '{{ .Values.defaults.image_registry | default "" }}'
     repository: '{{ .Values.defaults.image_org | default "voltha/" }}voltha-openolt-adapter'
+    tag_go: '{{ .Values.defaults.image_tag | default "master-go" }}'
     tag: '{{ .Values.defaults.image_tag | default .Chart.AppVersion }}'
     pullPolicy: '{{ .Values.defaults.image_pullPolicy | default "Always" }}'