@Override
  public void initFilter(FilterContainer container, Configuration conf) {
    Map<String, String> filterConfig = getFilterConfigMap(conf, PREFIX);

    container.addFilter("authentication", AuthenticationFilter.class.getName(), filterConfig);
  }
Initializes hadoop-auth AuthenticationFilter.
<p>
Propagates to hadoop-auth AuthenticationFilter configuration all Hadoop configuration
properties prefixed with "hadoop.http.authentication."
@param container The filter container
@param conf      Configuration for run-time parameters
hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/AuthenticationFilterInitializer.java