@Override
  protected void enableRSGroup(Configuration conf) {
    conf.set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY, RSGroupAdminEndpoint.class.getName());
    conf.set(HConstants.HBASE_MASTER_LOADBALANCER_CLASS, RSGroupBasedLoadBalancer.class.getName());
  }
Test enable RSGroup using the old coprocessor way, to make sure that we keep compatible with old
config way.
hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestEnableRSGroupsCompatibility.java