Bump to 2.4.4 tag for VOLTHA2.4 branching

Change-Id: I33379c2f10228cd76b8eb5754d56f76f3f481bbc
diff --git a/VERSION b/VERSION
index a71cbf4..79a6144 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.4-dev
+2.4.4