@Override
  public void setConf(Configuration conf) {
    this.conf = conf;
  }
If the passed in authorization is null, then this ScanLabelGenerator feeds the set of predefined
authorization labels for the given user. That is the set defined by the admin using the
VisibilityClient admin interface or the set_auths shell command. Otherwise the passed in
authorization labels are returned with no change. Note: This SLG should not be used alone because
it does not check the passed in authorization labels against what the user is authorized for.
hbase-server/src/main/java/org/apache/hadoop/hbase/security/visibility/FeedUserAuthScanLabelGenerator.java