@AfterClass
  public static void tearDown() throws Exception {
    hbaseTestingUtility.shutdownMiniCluster();
  }
Verify that the Online config Changes on the HRegionServer side are actually happening. We should
add tests for important configurations which will be changed online.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerOnlineConfigChange.java