Tag version 2.0.0

Also update to maven docker image
tag that is SemVer compliant.

Change-Id: I444f8ee36127af385530c5be56874ea8908e5bee
diff --git a/VERSION b/VERSION
index d72f262..227cea2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.0-dev
+2.0.0