@Override
    public GetResponse get(final RpcController controller, final ClientProtos.GetRequest request)
      throws ServiceException {
      exceptions.throwOnGet(this, request);
      return super.get(controller, request);
    }
Test that our cleanOverlappingRegions doesn't incorrectly remove regions from cache. Originally
encountered when using floorEntry rather than lowerEntry.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaCache.java