MB-11565 Open collection info download links in new tab.

Change-Id: If91308a22ee6a917c7ba8d4dce58bab29cccf606
Reviewed-on: http://review.couchbase.org/39034
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>