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/connection_mgr.py b/python/ofagent/connection_mgr.py
index fea4910..11a1334 100755
--- a/python/ofagent/connection_mgr.py
+++ b/python/ofagent/connection_mgr.py
@@ -20,19 +20,17 @@
 from twisted.internet import reactor
 from twisted.internet.defer import Deferred, inlineCallbacks, returnValue
 
-from common.utils.asleep import asleep
-from common.utils.consulhelpers import get_endpoint_from_consul
+from pyvoltha.common.utils.asleep import asleep
+from pyvoltha.common.utils.consulhelpers import get_endpoint_from_consul
 from structlog import get_logger
 import grpc
 from grpc import StatusCode
 from grpc._channel import _Rendezvous
-from ofagent.protos import third_party
-from protos import voltha_pb2
-from protos.voltha_pb2 import OfAgentSubscriber
+from voltha_protos.voltha_pb2 import OfAgentSubscriber
 from grpc_client import GrpcClient
 
 from agent import Agent
-from common.utils.dockerhelpers import get_my_containers_name
+from pyvoltha.common.utils.dockerhelpers import get_my_containers_name
 
 
 log = get_logger()