protected void closeCache(VM vm) {
    vm.invoke((SerializableRunnableIF) CacheServerTestUtil::closeCache);
  }
Returns the durable client proxy's HARegionQueue region name. This method is accessed via
reflection on a server VM.

@return the durable client proxy's HARegionQueue region name
geode-cq/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DurableClientTestBase.java