Moving Multicast subsystem into app and refactoring APIs to support multihomed sources and sinks

Change-Id: I95d07b163c619b018ff106159b134ff214aa2ffd
diff --git a/modules.defs b/modules.defs
index f995044..9611f17 100644
--- a/modules.defs
+++ b/modules.defs
@@ -239,6 +239,7 @@
     '//apps/kafka-integration:onos-apps-kafka-integration-oar',
     '//apps/rabbitmq:onos-apps-rabbitmq-oar',
     '//apps/odtn:onos-apps-odtn-oar',
+    '//apps/mcast:onos-apps-mcast-oar',
 ]
 
 PROTOCOL_APPS = [