Remove logging message on stats update DeadlineExceededError.
Remove logging message on stats update DeadlineExceededError.

stats_framework already generates a logging entry, no need to create a second
one.

TBR=vadimsh@chromium.org
BUG=

Review URL: https://codereview.appspot.com/14455055

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