BUMP 2.7.3
post 2.7.3
SERVER-14135 implement processHandshake() in LegacyReplicationCoordinator
SERVER-14135 implement getElectionId() in LegacyReplicationCoordinator
SERVER-14135 implement waitUpToOneSecondForOptimeChange() in LegacyReplicationCoordinator
SERVER-14135 implement shutdown() in LegacyReplicationCoordinator
SERVER-14135 implement buildsIndexes() in LegacyReplicationCoordinator
SERVER-14135 implement getHostsWrittenTo() in LegacyReplicationCoordinator
 SERVER-14135 remove some usage of godMode and replSet bool from LegacyReplicationCoordinator
Merge remote-tracking branch 'upstream/master'