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/Gopkg.lock b/Gopkg.lock
index 6d17f4b..5539da0 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -301,7 +301,7 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:2c1d6ea362dc6d4925599e93fa108d913078141a7149de49e868b24110f0ee7e"
+  digest = "1:b8d30e71e7cdb75584d2c85caec669e6f3e1c4dd4f89f767dd835bd2104e988b"
   name = "github.com/opencord/voltha-protos"
   packages = [
     "go/afrouter",
@@ -313,7 +313,7 @@
     "go/voltha",
   ]
   pruneopts = "T"
-  revision = "12fc0af25cd0e34555535be9949af64556569fcb"
+  revision = "aa26066f768886fc79374fd2c56e89191844779d"
 
 [[projects]]
   branch = "master"