Moving to onos 2.5.6 with karaf 4.2.14 and flow rule store fix

Change-Id: Ia310b19c099f57859099d4f4e4cacb4d4af36662
diff --git a/Dockerfile.voltha-onos b/Dockerfile.voltha-onos
index 94d8c1f..dfc5456 100644
--- a/Dockerfile.voltha-onos
+++ b/Dockerfile.voltha-onos
@@ -34,11 +34,11 @@
 
 
 # Unpack and install specific apps from download stage
-FROM onosproject/onos:2.5.5 as install
+FROM onosproject/onos:2.5.6 as install
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
-ENV KARAF_VERSION=4.2.9
+ENV KARAF_VERSION=4.2.14
 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:2.5.5
+FROM onosproject/onos:2.5.6
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
-ENV KARAF_VERSION=4.2.9
+ENV KARAF_VERSION=4.2.14
 ENV KARAF_ROOT=${ONOS}/apache-karaf-${KARAF_VERSION}
 ENV KARAF_M2=${KARAF_ROOT}/system
 ENV APPS_ROOT=${ONOS}/apps