fixing INVALID_GROUP error for FAILOVER type

Change-Id: Ieec82404d347dc812f49cf40c617e667381249d8

@@ -154,8 +154,17 @@ 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);
         }