private void createBlackboard() throws Exception {
    if (blackboard == null) {
      blackboard = DistributedLockBlackboardImpl.getInstance();
    }
  }
Returns a previously created (or new, if this is the first time this method is called in this
VM) distributed system which is somewhat configurable via hydra test parameters.
geode-core/src/distributedTest/java/org/apache/geode/distributed/DistributedLockServiceDUnitTest.java