servod: tame the servo watchdog a bit

This change turns the periodic warning when the watchdog loses
connectivity (i.e. when rebooting cr50) into a debug message. That way
users get spammed less.

BUG=None
TEST=manual testing
> unplug ccd
> wait 10s
> observe only the 'Turning down servod.'

2019-05-23 16:07:50,965 - servod - INFO - Listening on localhost port
9995

2019-05-23 16:08:05,165 - ServoDeviceWatchdog - ERROR - Device - vid:
0x18d1 pid: 0x5014 serial: u'0281102A-92E74880' - not found when
polling. Turning down servod.
2019-05-23 16:08:05,166 - servod - INFO - Received signal: 15.
Attempting to turn off

Change-Id: Ib8ec88e3246d67f4e1880feceda2423d02ac2a63
Signed-off-by: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1628228
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@google.com>
1 file changed