FinalizeJoinOperation should not be blocking, when multiple nodes start simultaneously, finalization process can be deadlock.
Improved ClusterMembershipTest. Hopefully fixes test failure. Fixes #4147.
TimedMemberStateFactory periodic task checking partition safety should be scheduled on ManagementCenterService.start() instead of constructor.
Merge pull request #4168 from mdogan/join-finalize

FinalizeJoinOperation should not be blocking