Ensure that generated enum values have the correct base classes

Enum values should share the same base classes as their defining class.
If this is not the case it may lead to wrong inference results when an
enum member is used - e.g. for the following snippet:

class X(enum.IntEnum):
    one = 1

print([1, 2][X.one])

pylint will detect a "invalid-sequence-index" error as the __index__
method of X.one is not detected.

--HG--
branch : enum-fixes

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