[ONOS-4476]As with Group type is FAILOVER,watchPort&watchGroup does not set corr…

…ectly When builds the Group Modification Openflow message

Change-Id: I344e3b03cd18e16f4e30ceb5b67ce9e55e871876

@@ -194,8 +194,17 @@ public final class GroupModBuilder {
             if (type == GroupDescription.Type.SELECT) {
                 bucketBuilder.setWeight(1);
             }
-            bucketBuilder.setWatchGroup(OFGroup.ANY);
-            bucketBuilder.setWatchPort(OFPort.ANY);
+            if (type == GroupDescription.Type.FAILOVER && bucket.watchPort() != null) {
+                bucketBuilder.setWatchPort(OFPort.of((int) bucket.watchPort().toLong()));
+            } else {
+                bucketBuilder.setWatchPort(OFPort.ANY);
+            }
+            if (type == GroupDescription.Type.FAILOVER &&  bucket.watchGroup() != null) {
+                bucketBuilder.setWatchGroup(OFGroup.of(bucket.watchGroup().id()));
+            } else {
+                bucketBuilder.setWatchGroup(OFGroup.ANY);
+            }
+
             OFBucket ofBucket = bucketBuilder.build();
             ofBuckets.add(ofBucket);
         }