@Override
  public Configuration getConfiguration() {
    return super.getConfiguration();
  }
Returns this classes's instance of {@link Configuration}. Be careful how you use the returned
Configuration since {@link Connection} instances can be shared. The Map of Connections is keyed
by the Configuration. If say, a Connection was being used against a cluster that had been
shutdown, see {@link #shutdownMiniCluster()}, then the Connection will no longer be wholesome.
Rather than use the return direct, its usually best to make a copy and use that. Do
<code>Configuration c = new Configuration(INSTANCE.getConfiguration());</code>
@return Instance of Configuration.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java