MB-11510: added date and tz info to cbcollect_info

Change-Id: I0ab7b2193f04f22564aaae3821de55a796f0e710
Reviewed-on: http://review.couchbase.org/38708
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>