Python 2.6 doesn't support context manager for GzipFile. Revert to original behaviour.
Fixes: https://pagure.io/koji/issue/1431
Metadata Update from @tkopecek: - Pull-request tagged with: testing-ready
Commit b42eabf7 fixes this pull-request
Pull-Request has been merged by mikem
Metadata Update from @jcupova: - Pull-request tagged with: testing-done
Python 2.6 doesn't support context manager for GzipFile. Revert to
original behaviour.
Fixes: https://pagure.io/koji/issue/1431