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/.gitignore b/.gitignore
index 2306a46..dba4360 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,8 +59,7 @@
 # voltha cli history
 # ignore uneeded items in vendor folders