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/agent.py b/python/ofagent/agent.py
index 6117c8f..aa45f67 100755
--- a/python/ofagent/agent.py
+++ b/python/ofagent/agent.py
@@ -22,7 +22,7 @@
 from twisted.internet.defer import Deferred, inlineCallbacks
 
 import loxi.of13 as of13
-from common.utils.asleep import asleep
+from pyvoltha.common.utils.asleep import asleep
 from of_connection import OpenFlowConnection
 from of_protocol_handler import OpenFlowProtocolHandler