Fix CMFCategory test in Python 2.
- The warnings are compared in a set instead of a list, as we do not care of how many times is the warning raised. - The warning filter is added inside the context manager, as recommended in https://docs.python.org/2.7/library/warnings.html#testing-warnings . - We change the `clear` method of list, using `del` instead, as the `clear` method was added on Python 3.3.
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