SERVER-15329 add a short sleep if our handshake is rejected because we are not in the current config
SERVER-15062 interesting heartbeat actions coming from first and second retries
SERVER-15062 high verbosity processHeartbeatResponse tests
SERVER-15062 a few more processHeartbeatResponse() tests
SERVER-15062 test reconfig via updateConfig() in the TopologyCoordinator
SERVER-15062 fix UpdateHeartbeatDataPrimaryDownMajorityButIAmArbiter to hit the correct branch
SERVER-15062 change redundant branch to invariant
SERVER-15374 test shouldChangeSyncSource() in TopologyCoordintor