Revert "swarming: skip flaky test"
Revert "swarming: skip flaky test"

This reverts commit 2be85a9598a710bc200df6f137b599b714a7e8ac.

Reason for revert: the test failure happened on python2 server with python3 bot.
https://logs.chromium.org/logs/infra/buildbucket/cr-buildbucket.appspot.com/8874908077901988672/+/u/swarming/run_tests_python2/stdout#L7570_5

Maybe, the step needs to be separated.

Original change's description:
> swarming: skip flaky test
> 
> This is flaky in python2 too.
> https://logs.chromium.org/logs/infra/buildbucket/cr-buildbucket.appspot.com/8874908077901988672/+/u/swarming/run_tests_python2/stdout#L6368_0
> 
> Change-Id: Id5df9ccd9dfd9f7e7a0df7825c11d47150c8beea
> Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2294655
> Commit-Queue: Ye Kuang <yekuang@google.com>
> Reviewed-by: Ye Kuang <yekuang@google.com>
> Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

TBR=71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org,aaef61ef98ffea505db831f310be2a0eb8492537@google.com,yekuang@google.com,infra-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Iaefdaf0bdb9263ba0568aef8096ab9a5b8e258ac
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2299162
Reviewed-by: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py