Add @Beta annotation because APIs is not stabilized yet

Change-Id: Id6111180be6c21a5287e2b53abacdfb43931abd4

@@ -15,10 +15,12 @@
  */
 package org.onosproject.net.resource.device;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.net.intent.IntentId;
 
 import java.util.Set;
 
+@Beta
 public interface IntentSetMultimap {
 
     /**

@@ -15,6 +15,7 @@
  */
 package org.onosproject.store.resource.impl;
 
+import com.google.common.annotations.Beta;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -42,6 +43,7 @@ import static org.slf4j.LoggerFactory.getLogger;
  */
 @Component(immediate = true, enabled = true)
 @Service
+@Beta
 public class ConsistentIntentSetMultimap implements IntentSetMultimap {
     private final Logger log = getLogger(getClass());