private void doDestroyOnVm(final VM vm, final Object key, final String regionName) {
    vm.invoke(() -> doDestroy(key, regionName));
  }
Performs a destroy operation on a vm.

@param vm a virtual machine.
@param key the region entry to destroy.
@param regionName a region name.
geode-core/src/distributedTest/java/org/apache/geode/management/OffHeapManagementDUnitTest.java