MB-11873: made remote bucket info invalidation work

invalidate_remote_bucket_by_ref/1 was broken due to conflation of
cluster name and uuid. Now it's fixed.

Change-Id: If60495d12b2ae12d057ebfd947e02a6a99223144
Reviewed-on: http://review.couchbase.org/40271
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>