[VOL-4138] Moving ONOS to 2.5 version, including now external SR app

Change-Id: I4ad847b9ee0e2bf2b23d08d24c167f95227d0dfb
diff --git a/Dockerfile.voltha-onos b/Dockerfile.voltha-onos
index a7359f7..97d42ae 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 as install
+FROM onosproject/onos:2.5-latest 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
+FROM onosproject/onos:2.5-latest
 
 # The ENV settings must be replicated below as they are not shared between stages
 ENV ONOS=/root/onos
@@ -77,6 +77,7 @@
 RUN touch $ONOS/apps/org.onosproject.openflow-base/active
 RUN touch $ONOS/apps/org.onosproject.lldpprovider/active
 RUN touch $ONOS/apps/org.onosproject.mcast/active
+RUN touch $ONOS/apps/org.onosproject.segmentrouting/active
 
 # Label image
 ARG org_label_schema_version=unknown