Dep update and update python requirements.txt

dep update protos to current tagged version.
No functional change.

Update requirements.txt to pip released versions
of voltha-protos and pyvoltha.

Also doc update to reflect golang 1.12 install and
combined Makefile

Change-Id: I455cc84ab4ead7aa26f49c3d35227f5d8a360808
diff --git a/python/requirements.txt b/python/requirements.txt
index c3ead8b..b77bda8 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -60,8 +60,8 @@
 etcd3==0.7.0
 pyparsing==2.2.0
 packaging==17.1
-pyvoltha==0.1.8
-voltha-protos==0.1.2
+pyvoltha==0.1.9
+voltha-protos==0.1.3
 
 # python-consul>=0.6.1  we need the pre-released version for now, because 0.6.1 does not
 # yet support Twisted. Once this is released, it will be the 0.6.2 version