recognize auth to this node by 127.0.0.1 hostname

Change-Id: Id64c78a26dfa2603e0460b78cace319dccfc0c47
Reviewed-on: http://review.couchbase.org/44553
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>