MB-8132:cbcollect_info: don't use try..except..finally

Because python 2.4 doesn't have it :(

Change-Id: I3a407c2915b04f0dc9b1ee0afff44d1043eb8f32
Reviewed-on: http://review.couchbase.org/25806
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>