debian: simplify rules
recovery: prettification
recovery: dc2: fixed exception on container load

On alpha tests we've got an error:
    06 Jun 13 14:06:18 MainProcess WARNING Computing merge and splitting by node all remote results
    Traceback (most recent call last):
      File "/usr/bin/dnet_recovery", line 195, in <module>
        result = main(ctx)
      File "/usr/lib/python2.6/dist-packages/elliptics_recovery/types/dc2.py", line 361, in main
        splitted_results = merge_and_split_diffs(g_ctx, diff_results, g_ctx.stats)
      File "/usr/lib/python2.6/dist-packages/elliptics_recovery/types/dc2.py", line 267, in merge_and_split_diffs
        leave_file=True
      File "/usr/lib/python2.6/dist-packages/elliptics_recovery/iterator.py", line 96, in from_filename
        result = cls.from_fd(container_file.fileno(), tmp_dir=tmp_dir, filename=filename, **kwargs)
      File "/usr/lib/python2.6/dist-packages/elliptics_recovery/iterator.py", line 126, in from_fd
        result = cls(**kwargs)
    TypeError: __init__() got an unexpected keyword argument 'is_sorted'