[swarming] Ignore runtime.DeadlineExceededError at some bot_event
[swarming] Ignore runtime.DeadlineExceededError at some bot_event

runtime.DeadlineExceededError is still happening at deployment
http://screen/Yubzd8ikSUh

Bug: 1027407
Change-Id: If57329c9ce103a15083d724744071a8543db8f1d
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1990919
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Auto-Submit: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

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