QuorumChecker getQuorumChecker() {
    return quorumChecker;
  }
If this DistributedSystem is attempting to reconnect to the distributed system this will return
the quorum checker created by the old {@link Distribution} for checking to see if a quorum of
old
members can be reached.

@return the quorum checking service
geode-core/src/main/java/org/apache/geode/distributed/internal/InternalDistributedSystem.java