MB-9848 Decrease number of messages logged on port crash.

Most of them are of no use for the user and can be obtained from the
logs.

Change-Id: I73f39c712d23e71cb22d3f07dbb5d58b6ab743d4
Reviewed-on: http://review.couchbase.org/33014
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>