Moving 2.2 to the latest apps

Change-Id: I2fa6afa498240b51297159dfa004c2a93a1e246c
diff --git a/Dockerfile.voltha-onos b/Dockerfile.voltha-onos
index 487db44..941226b 100644
--- a/Dockerfile.voltha-onos
+++ b/Dockerfile.voltha-onos
@@ -34,11 +34,11 @@
 
 
 # Unpack and install specific apps from download stage
-FROM onosproject/onos:2.2.0 as install
+FROM onosproject/onos:2.2-latest as install
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
-ENV KARAF_VERSION=4.2.6
+ENV KARAF_VERSION=4.2.8
 ENV KARAF_ROOT=${ONOS}/apache-karaf-${KARAF_VERSION}
 ENV APPS_ROOT=${ONOS}/apps
 ENV KARAF_M2=${KARAF_ROOT}/system
@@ -58,11 +58,11 @@
 
 
 # Create the final image coping over the installed applications from the install stage
-FROM onosproject/onos:2.2.0
+FROM onosproject/onos:2.2-latest
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
-ENV KARAF_VERSION=4.2.6
+ENV KARAF_VERSION=4.2.8
 ENV KARAF_ROOT=${ONOS}/apache-karaf-${KARAF_VERSION}
 ENV KARAF_M2=${KARAF_ROOT}/system
 ENV APPS_ROOT=${ONOS}/apps