public ExecutorService getExecutorService() {
    return delegate.get().getExecutorService();
  }
Constructs a {@code DistributedExecutorServiceRule} which performs {@code shutdownNow} and
thread dump of its threads if any were left running during {@code tearDown}.

@param threadCount The number of threads in the pool. Creates fixed thread pool if &gt; 0; else
       creates cached thread pool.
@param vmCount specified number of VMs
geode-dunit/src/main/java/org/apache/geode/test/dunit/rules/DistributedExecutorServiceRule.java