@Override
      public void run() {
        Mycallback myDuringPackingImage =
            new Mycallback(GIITestHookType.AfterReceivedRequestImage, REGION_NAME);
        setGIITestHook(myDuringPackingImage);
      }
vm0 and vm1 are peers, each holds a DR. Let P and R have the same RVV and RVVGC: P7,R6, RVVGC
is P0,R0. vm1 becomes offline then restarts. Use testHook to pause the GII, then do tombstone
GC triggered by expireBatch (not by forceGC) at R only. The tombstone GC will be executed at P,
but ignored at R, because P has not started providing GII and R is not initialized yet.
The deltaGII should send nothing to R since the RVVs are the same. So after
GII, P and R will have different tombstone number. But P's tombstones should be expired.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/GIIDeltaDUnitTest.java