def unlocked_release(id)
      lock_file = @machine_locks[id]
      if lock_file
        lock_file.close
        begin
          File.delete(lock_file.path)
        rescue Errno::EACCES
          # Another process is probably opened it, no problem.
        end

        @machine_locks.delete(id)
      end
    end
def unlocked_release(id)
      lock_file = @machine_locks[id]
      if lock_file
        lock_file.close
        begin
          File.delete(lock_file.path)
        rescue Errno::EACCES
          # Another process is probably opened it, no problem.
        end

        @machine_locks.delete(id)
      end
    end
Releases a local lock on a machine. This does not acquire any locks
 so make sure to lock around it.

 @param [String] id