execute (Rake::RemoteTask::Action)

    # File lib/rake_remote_task.rb, line 568
        def execute hosts, task, args
          hosts.each do |host|
            t = task.clone
            t.target_host = host
            thread = Thread.new(t) do |task|
              Thread.current[:task] = task
              case block.arity
              when 1
                block.call task
              else
                block.call task, args
              end
              Thread.current[:task] = nil
            end
            @workers.add thread
          end
          @workers.list.each { |thr| thr.join }
        end