Release version 3.3.3 of the openolt agent

Change-Id: Id2f921f9b914c7b3ca83effb5cc171708e8081f9
diff --git a/VERSION b/VERSION
index 6e9a403..619b537 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.3.3-dev
+3.3.3