Matthew Treinish 12552cee70 Fix subunit collection in functional tests with ostestr>=1.0.0
With the release of os-testr 1.0.0 stestr is used internally and because
of that the repository dir and commands to get subunit are different.
This commit updates the post-test hook to get the subunit stream if
ostestr>=1.0.0 is used.

Change-Id: I2cce7f4780ce418398b17a5848def9072372841e
2017-09-15 10:35:53 -05:00
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