private AsyncInvocation<Void> performOps4ClearWithConcurrentEvents(VM vm) {
    return vm.invokeAsync("perform concurrent ops", () -> {
      try {
        doOpsLoop(true);
      } catch (CacheException e) {
        fail("while performing concurrent operations", e);
      }
    });
  }
Clear all existing transaction listeners and install the given listener.
geode-dunit/src/main/java/org/apache/geode/cache30/MultiVMRegionTestCase.java