Add information about parent module in inference on a module element

[pylint-bot]

Originally reported by: Laura Médioni (BitBucket: lmedioni, GitHub: lmedioni)

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For now, inference on:

import multiprocessing
multiprocessing.SyncManager()

tells SyncManager root is a module whose name is ''.

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• Bitbucket: https://bitbucket.org/logilab/astroid/issue/265