@Override
  public int getDMType() {
    return dmType;
  }
Asserts that distributionManagerType is LOCAL, GEMFIRE, or ADMIN_ONLY. Also asserts that the
distributionManagerId (jgroups DistributedMember) has a VmKind that matches.
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java