def add_master( *args )
      args.map do |key|
        key = to_key(key)
        @masters << key unless @masters.include? key
        key
      end
    end
def add_master( *args )
      args.map do |key|
        key = to_key(key)
        @masters << key unless @masters.include? key
        key
      end
    end
call-seq:
    add_master( 'First::Name', 'Second::Name', ... )

 Add the given logger names to the list of consolidation masters. All
 classes in the given namespace(s) will use these loggers instead of
 creating their own individual loggers.