General cleanup

- Remove unused Dockerfiles
- Simplify Makefile
- Use tox.ini to store nose config
- Bump version of voltha-protos and fix test

Change-Id: I8d6a1e8dfafd84bd21f495b0f6b96885f829c208
diff --git a/requirements.txt b/requirements.txt
index 8b1a953..558f67b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,5 +50,5 @@
 Twisted==18.7.0
 txaioetcd==0.3.0
 urllib3==1.22
-voltha-protos==0.1.0
+voltha-protos==0.1.2
 afkak==3.0.0.dev20181106