Print SIGTERM logging to debug

Sending SIGTERM to the ssh-agent is a standard part of shutting down the
executor. It stands out it logs when everything else is at debug, but a
TERM signal is more important. This is not something that needs looked
at so should just be debug.

Change-Id: I31f15cc24bb185a0f95ac9d1c30ba852fd5cbd53
1 file changed