[autotest] Skip checking service status for backup servers.

After backup server is updated, there is no need to guarantee services are
running since services like scheduler is meant to be stopped in backup servers.

BUG=chromium:448991
TEST=local setup with dryrun

Change-Id: I2d3bd39df1f03d06bbe314a857dfc27c75ca821b
Reviewed-on: https://chromium-review.googlesource.com/242751
Trybot-Ready: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
2 files changed