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/python/ofagent/of_connection.py b/python/ofagent/of_connection.py
index 1dcc521..a941111 100755
--- a/python/ofagent/of_connection.py
+++ b/python/ofagent/of_connection.py
@@ -18,7 +18,7 @@
 from twisted.internet import protocol
 
 import loxi.of14
-from common.utils.message_queue import MessageQueue
+from pyvoltha.common.utils.message_queue import MessageQueue
 
 log = structlog.get_logger()