Enum support should be tested with PyPi backport

[pylint-bot]

Originally reported by: BitBucket: ceridwenv, GitHub: ceridwenv

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At the moment, the brain tests only try to import the stdlib version of enum:

try:
    import enum # pylint: disable=unused-import
    HAS_ENUM = True
except ImportError:
    HAS_ENUM = False

This should be extended to include the backport for earlier Python versions, https://pypi.python.org/pypi/enum34.

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• Bitbucket: https://bitbucket.org/logilab/astroid/issue/248

[pylint-bot]

Original comment by BitBucket: ceridwenv, GitHub: ceridwenv:

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Added in b68ee1186e5f.