MB-100: always send basicStats

Because this private field leakead into our public documentation here:
http://www.couchbase.com/docs/couchbase-manual-2.0/restapi-named-bucket-info.html

We still send storageTotals (which is brand-new field) only if it's
request from our UI.

Change-Id: I212bbafd9644c6eea87fa51323b5d1768ef8e33d
Reviewed-on: http://review.couchbase.org/27840
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>