This commit will enable collection of subunit results from all subunit
emitting jobs in the gate and periodic pipelines. Now that we prune
the database to only 6 months of history we should have plenty of
headroom for the extra data generated by non-tempest-dsvm jobs.
(hopefully)
Depends-On: I58a640f804313e1e4b80680f0e39b86d76cb29da
Change-Id: If5691af792409f02352f25b1498dd78294a7cd74