[CRIU] CLI Improvement

[Saied Kazemi]

Pavel,

Please see the attached patch.  We can simplify CRIU command line options
by using --root and dropping --aufs-root when dumping a Docker container.
 The less command line options, the better :)

On a related note, I am happy to let you know that CRIU can successfully
dump and restore Docker containers using the UnionFS graph driver.
 Fortunately, the /proc/<pid>/map_files for UnionFS does not have the issue
that we saw with AUFS.

Cheers!

--Saied
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