Releasing voltha-onos with updated apps and ONOS 2.2.8 for VOLTHA 2.7

Change-Id: Ic3291db86fee2ae8deec37d48db0b2737fc74f9c
diff --git a/VERSION b/VERSION
index dcdc5e9..f77856a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.3.1-dev3
+4.3.1