@Override
      public void run() {
        Mycallback myAfterReceivedRequestImage =
            new Mycallback(GIITestHookType.AfterReceivedRequestImage, REGION_NAME);
        InitialImageOperation.setGIITestHook(myAfterReceivedRequestImage);
      }
vm0 and vm1 are peers, each holds a DR. Let provider to have higher RVVGC than requester's RVV
It should trigger fullGII

This test also verify tombstoneGC happened in middle of GII, but BEFORE GII thread got GIILock.
i.e. before GII, P's RVVGC=P0,R0, upon received RequestImageMessage, it becomes P4,R0 it should
cause the fullGII.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/GIIDeltaDUnitTest.java