[blinkpy] Tweak git cl issue

This would make it work correctly if anyone else runs
into the issue with some other message in the output
before the issue number, although this is still just
a hack.

Bug: 868469
Change-Id: Ib0a66a4374ae4db9807d11feb3d150d261ce0dd6
Reviewed-on: https://chromium-review.googlesource.com/1156994
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579560}
2 files changed