MB-10020 add access.log to /diag and cbcollect_info

Change-Id: I45ba7f0a21925657984e4e7702005c75b392d0f8
Reviewed-on: http://review.couchbase.org/36842
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Artem Stemkovski <artem@couchbase.com>