Moving to released ONOS 2.2.1

Change-Id: Ib0aec16e89a0119970b88323ccd120c6070ea10b
diff --git a/Dockerfile.voltha-onos b/Dockerfile.voltha-onos
index b9b9fde..82b892d 100644
--- a/Dockerfile.voltha-onos
+++ b/Dockerfile.voltha-onos
@@ -34,7 +34,7 @@
 
 
 # Unpack and install specific apps from download stage
-FROM onosproject/onos:2.2-latest@sha256:816d98aba07771e877cfd895d05d86f06a00fc2cc37c936ecb565f1ca286b4e6 as install
+FROM onosproject/onos:2.2.1 as install
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
@@ -58,7 +58,7 @@
 
 
 # Create the final image coping over the installed applications from the install stage
-FROM onosproject/onos:2.2-latest@sha256:816d98aba07771e877cfd895d05d86f06a00fc2cc37c936ecb565f1ca286b4e6
+FROM onosproject/onos:2.2.1
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
diff --git a/VERSION b/VERSION
index ad6abd3..1454f6e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.1-dev
+4.0.1