MB-100: removed superfluous calls checking_bucket_access

Change-Id: Ieafe64ab40d0326678cb5b1c7eb6ebf9fcbef3b7
Reviewed-on: http://review.couchbase.org/27947
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>