[VOL-5408]-Update versions of VOLTHA components for release

Signed-off-by: Mahir Gunyel <mahir.gunyel@netsia.com>
Change-Id: I3a1075d6cbf48d427aeb3bebec58af6cb7957c12
diff --git a/VERSION b/VERSION
index d64a644..2bf1c1c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.0-dev
+2.3.1