SERVER-14277 Clean up some cases of throwing strings when parsing replset configs
SERVER-14277 Implement processReplSetReconfig in LegacyReplicationCoordinator
SERVER-14277 Implement processReplSetInitiate in LegacyReplicationCoordinator
SERVER-14318 Implement processReplSetGetRBID in LegacyReplicationCoordinator
SERVER-14318 Implement processReplSetFresh in LegacyReplicationCoordinator
SERVER-14318 Implement processReplSetElect in LegacyReplicationCoordinator