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The dsvm jobs were not being run if only test-requirements.txt was modified. However, devstack installs test-requirements so we should run those jobs if that file changes. The grenade multinode jobs were not being run if requirements.txt was modified -- this was due to an extra '|' which caused it to be considered an irrelevant file :-( Change-Id: I1a49915ca52a93e77849dc5ead655656ad1bb34e