MB-100 slight logging improvement for babysitter

- little bit more info about which port is getting terminated

Change-Id: Id77fb32d8ceef7aa7bdd9a8697dbbe120d4db946
Reviewed-on: http://review.couchbase.org/29210
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>