[swarming] skip flaky test_priority in local_smoke_test.py
[swarming] skip flaky test_priority in local_smoke_test.py

It sometimes fails like
https://logs.chromium.org/logs/infra/led/jwata_google.com/bf0503f77d80fb2c7bc9a733644eb97dd1b4b0dfe510d8f066f7d53b08847897/+/u/swarming/run_tests_python2/stdout#L5578_1

Bug: 1010816
Change-Id: I6b674f2f9d5e330f031698eb2a93a8949c3c85c4
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2294653
Auto-Submit: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

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