mtreinish / stestr / 420

59%

master: 68%

Pull #84

travis-ci

Use context managers for file open()

This commit tries to use context managers for file open(). In the
previous commit, it already has been done as a bug fix. However, these
also can be fixed to close files. In some cases, the original code are
not harmful, but I changed it to keep the code clean.

18 of 18 new or added lines in 3 files covered. (100.0%)

1215 of 2061 relevant lines covered (58.95%)

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