VOL-291 : PON simulator refactoring for cluster integration

- Added ponsim build target in Makefile
- Added new option to vcore to select comm type with ponsim
- Modified all proto files to include destination go package

Amendments:

- Clean up based on review comments
- Properly close GRPC connections in ponsim_olt adapter
- Added voltha namespace to some k8s templates

Change-Id: I2f349fa7b3550a8a8cc8fc676cc896f33fbb9372
diff --git a/k8s/olt.yml b/k8s/olt.yml
index 9093c3b..88925ec 100644
--- a/k8s/olt.yml
+++ b/k8s/olt.yml
@@ -2,6 +2,7 @@
 kind: Service
 metadata:
    name: olt
+   namespace: voltha
    labels:
      name: olt
 spec:
@@ -16,6 +17,7 @@
 kind: Deployment
 metadata:
   name: olt
+  namespace: voltha
 spec:
    replicas: 1
    template: