Fix regression in setup_bot().
Fix regression in setup_bot().

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.appspot.com/165870043

pombreda/swarming,madecoste/swarming,madecoste/swarming,pombreda/swarming,pombreda/swarming,luci/luci-py,luci/luci-py,luci/luci-py,pombreda/swarming,madecoste/swarming,madecoste/swarming,luci/luci-py