Release olt-service 2.1.23

Change-Id: I642800a8d18bbc0e22541adf509073904b808562
diff --git a/VERSION b/VERSION
index 250be71..6156c34 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.23-dev
+2.1.23