boolean isShuttingDown() {
    return services.getCancelCriterion().isCancelInProgress()
        || services.getManager().shutdownInProgress()
        || services.getManager().isCloseInProgress();
  }
Transitions this member into the coordinator role. This must be invoked under a synch on
viewInstallationLock that was held at the time the decision was made to become coordinator so
that the decision is atomic with actually becoming coordinator.

@param oldCoordinator may be null
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/membership/GMSJoinLeave.java