MB-8578 pass bucket uuid to engines

Change-Id: I1e69f2021d5371ac4fae7db63645951af3859b0b
Reviewed-on: http://review.couchbase.org/27672
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>