Zane Bitter 7ef796bbcf Use group_regex to serialize scrubber tests
Instead of doing two separate test runs, use the group_regex option to
stestr to group tests that cannot be run in parallel into the same
worker.

Change-Id: I3d69d5c72d69484f4e1c9c0b11122d0cf3703d60
Related-Bug: #1768077
2018-06-07 09:25:04 -04:00
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