I looked at all runs over all jobs run against master or release-1.15,
ignored [Feature:.*] or [Serial] tests, and added [Slow] to any tests
whose 50th percentile duration was over 5 minutes
Misc comments:
- the apimachinery chunking test is the worst offender, at about 15min
- all test cases for all drivers that ran the [Testpattern:.*(xfs)] were
taking longer than 5 minutes, so I got lucky and this was an easy
call; not sure how to support some drivers taking too long for some
test patterns
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