Metaclass evaluation

[pylint-bot]

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

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There's a big potential of improvements regarding the metaclasses. We should definitely have some sort of evaluation, for code such as the following:

#!python

import six

class A(type):
   def __call__(cls):
        return 42

@six.add_metaclass(A)
class B(object):
   pass

b = B()
print(b.f) # b is an integer

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• Bitbucket: https://bitbucket.org/logilab/astroid/issue/173

[pylint-bot]

Original comment by Claudiu Popa (BitBucket: PCManticore, GitHub: PCManticore):

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We could try to respect this as much as possible: https://docs.python.org/3/reference/datamodel.html?highlight=metaclass#customizing-class-creation