bot_update: fix the check for is running on linux
Since python3.3, the platform value has been changed from linux2 or
linux3 to linux. The bug has stopped bot_update script from emitting
proces tree periodically that will be helpful when debugging.
R=sokcevic
Bug: 1455926
Change-Id: Id6ab4ddf46eaa322a8b5470baa7ba6cc656a6bb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4654290
Auto-Submit: Yiwei Zhang <yiwzhang@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>