RemoteWatcherSpec interference with real quarantining, see #3257
Increase time limits in CircuitBreakerMTSpec, see #3243
Additional coordination of shutdown in ClusterDeathWatchSpec, see #3255

* Added testconductor shutdown of actor system
* Renamed previous shutdown to exit
Merge pull request #1362 from akka/wip-3257-RemoteWatcherSpec-patriknw

RemoteWatcherSpec interference with real quarantining, see #3257
Merge pull request #1367 from akka/wip-3255-ClusterDeathWatchSpec2-patriknw

Additional coordination of shutdown in ClusterDeathWatchSpec, see #3255
Merge pull request #1363 from akka/wip-3243-CircuitBreakerMTSpec-patriknw

Increase time limits in CircuitBreakerMTSpec, see #3243