Don't ignore errors from ensure_bucket function.
Don't ignore errors from ensure_bucket function.

Change-Id: Ia56697c2f305991dc1a2cd09cde1539414699a43
Reviewed-on: http://review.couchbase.org/79284
Tested-by: Ajit Yagaty <670a5cadfa9668cb910cc315f6527868cd5ab42a@couchbase.com>
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server