c317ba8 Use unittest2 if available

Authored and Committed by lsedlar 7 years ago
    Use unittest2 if available
    
    The module backports features to Python 2.6 and 2.7. If it is available,
    the tests will use it. If it is not available, it will fall back to
    regular unittest. On Python 2.7, the tests pass anyway. On Python 2.6,
    there are failures with Python 2.6.
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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