import-error for some of the six.moves imports

[pylint-bot]

Originally reported by: Claudiu Popa (BitBucket: PCManticore, GitHub: @PCManticore?)

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We're missing a couple of six.moves imports, especially the ones which have submodules, as is the case of urllib.request.

#!python

from six.moves.urllib import request

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• Bitbucket: https://bitbucket.org/logilab/astroid/issue/174