YARN-10144. Federation: Add missing FederationClientInterceptor APIs. (#5587)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/clientrm/FederationClientInterceptor.java

@@ -194,15 +194,6 @@ import static org.apache.hadoop.yarn.server.router.RouterAuditLogger.AuditConsta
 public class FederationClientInterceptor
     extends AbstractClientRequestInterceptor {
 
-  /*
-   * TODO YARN-6740 Federation Router (hiding multiple RMs for
-   * ApplicationClientProtocol) phase 2.
-   *
-   * The current implementation finalized the main 4 calls (getNewApplication,
-   * submitApplication, forceKillApplication and getApplicationReport). Those
-   * allow us to execute applications E2E.
-   */
-
   private static final Logger LOG =
       LoggerFactory.getLogger(FederationClientInterceptor.class);