@Override
  public Optional<RemoteOperation> remoteCallBuild(final MasterProcedureEnv env,
    final ServerName serverName) {
    return Optional.empty();
  }
Leave here only for checking if we can successfully start the master.
@deprecated Do not use any more.
@see TransitRegionStateProcedure
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.java