remove lock from around last_cmd_timestamp
remove lock from around last_cmd_timestamp

kwlzn/watchman,kwlzn/watchman,nodakai/watchman,facebook/watchman,wez/watchman,kwlzn/watchman,wez/watchman,facebook/watchman,nodakai/watchman,kwlzn/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,nodakai/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,wez/watchman,wez/watchman,facebook/watchman,wez/watchman,wez/watchman