void cleanupTable(TableName tablename) throws Exception {
    if (tbl != null) {
      tbl.close();
      tbl = null;
    }
    connection.clearRegionLocationCache();
    deleteTable(TEST_UTIL, tablename);
  }
delete table in preparation for next test
hbase-server/src/test/java/org/apache/hadoop/hbase/util/BaseTestHBaseFsck.java