qa : fixed style and a bug reported by flake8
lib/spack/spack/test/versions.py:313: [F811] redefinition of unused 'test_union_with_containment' from line 306 Flake8 found errors.
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lib/spack/spack/test/versions.py:313: [F811] redefinition of unused 'test_union_with_containment' from line 306 Flake8 found errors.