MB-100: gather some numa stats in cbcollect_info

Change-Id: I9be7d1cfb626e0bca2859193fbd5a9b3aeeed0da
Reviewed-on: http://review.couchbase.org/25212
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>