MB-100 unbreak ns_config:test_cas_config

Change-Id: Ic21649e1791743c7ff5d611576e5966a97d2cdf4
Reviewed-on: http://review.couchbase.org/34754
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>