MirrorMaker2 fails to detect topic if remote topic is created first

Setup:

• 2 clusters: source and target
• Mirroring data from source to target
• create a topic called source.mytopic on the target cluster
• create a topic called mytopic on the source cluster
  At this point, MM2 does not start mirroring the topic.

This also happens if you delete and recreate a topic that is being mirrored.

The issue is in refreshTopicPartitions() which basically does a diff between the 2 clusters.
When creating the topic on the source cluster last, it makes the partition list of both clusters match, hence not triggering a reconfiguration