[dns-operations] open resolver versio.bind responses

[abang]

> http://openresolverproject.org/version.bind.report.txt

31146 'PowerDNS Recursor 3.5 $Id: pdns_recursor.cc 3153 2013-04-09 
15:09:32Z ahu $'

Wow, yesterday released!  (http://wiki.powerdns.com/trac/changeset/3156)