VOL-1500 VOL-1475 Updated the remaining python containers in voltha-go to use pyvoltha and voltha-protos

Changed the build system to have separate flags for local pyvoltha and local protos.
Cleared out now unneeded python libraries and protos from voltha-go

PonSim was tested by launching the system-test-ponsim.yml and making sure the ponsim enables.
This was tested on docker-compose and k8s.
Let me know if there are other cases to test.

Change-Id: Ie2d5a19900fcfc93b96aba2981efb18fd9e649bb
diff --git a/k8s/single-node/olt.yml b/k8s/single-node/olt.yml
index 148e1ad..ab12b5a 100644
--- a/k8s/single-node/olt.yml
+++ b/k8s/single-node/olt.yml
@@ -42,7 +42,7 @@
      spec:
        containers:
          - name: olt
-           image: "voltha-ponsim:latest"
+           image: "voltha/voltha-ponsim:latest"
            env:
              - name: POD_IP
                valueFrom: