extend filter-queries with ability to remove "special" queries

Queries for measurement domains operated by APNIC (like dotnxdomain.net., dashnxdomain.net.) have timestamps in them and too "old" queries get dropped, causing timeouts.

Replaying these queries is a problem for two reasons:

• it causes unnecessary load on APNIC's servers
• causes unrepresentative results because in normal operation resolver would have gotten answers (with "fresh" queries) instead waiting for timeouts