+con #15157 Changed ClusterSharding.start to return the shardRegion
ActorRef #15209

* Changed ClusterSharding.start to return the ActorRef to the shardRegion (#15157)

* Fixed indentation, and removed unused import

* Test for new API
* removed unused import

- Moved barrier outside of the runon
Merge pull request #15209 from jgordijn/15157-clustersharding-start-API-jgordijn

+con #15157 Changed ClusterSharding.start to return the shardRegian ActorRef