Tag version 2.0.0

Also use new versions of pyvoltha and voltha-protos

Change-Id: I787272981a8efd84f6090fc602eb726dfe65da76
diff --git a/VERSION b/VERSION
index 340db23..227cea2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.0-dev0
+2.0.0