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/main.py b/python/ofagent/main.py
index 4f0531c..e18e480 100755
--- a/python/ofagent/main.py
+++ b/python/ofagent/main.py
@@ -21,9 +21,9 @@
 from twisted.internet import reactor
 from twisted.internet.defer import inlineCallbacks
 
-from common.structlog_setup import setup_logging
-from common.utils.dockerhelpers import get_my_containers_name
-from common.utils.nethelpers import get_my_primary_local_ipv4
+from pyvoltha.common.structlog_setup import setup_logging
+from pyvoltha.common.utils.dockerhelpers import get_my_containers_name
+from pyvoltha.common.utils.nethelpers import get_my_primary_local_ipv4
 from connection_mgr import ConnectionManager
 
 defs = dict(