CORD-651 Restart policy for containers

Change-Id: I13538741b2ac7a524c2e5de6449d9f30a4d60541
diff --git a/roles/onos-fabric-install/templates/docker-compose.yml.j2 b/roles/onos-fabric-install/templates/docker-compose.yml.j2
index b98230f..1d48ca8 100644
--- a/roles/onos-fabric-install/templates/docker-compose.yml.j2
+++ b/roles/onos-fabric-install/templates/docker-compose.yml.j2
@@ -11,4 +11,5 @@
        - "8181:8181" # ONOS UI/API
        - "9876:9876" # ONOS Clustering
        - "2620:2620" # vRouter
+      restart: unless-stopped