Deprecate mcast APIs so they can be moved to an app later

Change-Id: I6d9745be4aa9052b03ccc5d1e55d1fd3970f1eee
diff --git a/core/api/src/main/java/org/onosproject/net/mcast/McastListener.java b/core/api/src/main/java/org/onosproject/net/mcast/McastListener.java
index 3ee9a0b..c233fb4 100644
--- a/core/api/src/main/java/org/onosproject/net/mcast/McastListener.java
+++ b/core/api/src/main/java/org/onosproject/net/mcast/McastListener.java
@@ -15,12 +15,13 @@
  */
 package org.onosproject.net.mcast;
 
-import com.google.common.annotations.Beta;
 import org.onosproject.event.EventListener;
 
 /**
  * A listener interface for multicast events.
+ *
+ * @deprecated in 1.11 ("Loon") release. To be moved into an app.
  */
-@Beta
+@Deprecated
 public interface McastListener extends EventListener<McastEvent> {
 }