MB-10020 rename access.log to http_access.log

Change-Id: I3a55049d4ca7484046f6537d7d1714fb8a12e9b1
Reviewed-on: http://review.couchbase.org/38197
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>