[cbcollecinfo] gather ssl_proxy logs too

Change-Id: I759b2ab5164dcba39f58895af834ef082f1cd2e3
Reviewed-on: http://review.couchbase.org/31751
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>