Petr Špaček authored Feb 24, 2022 and Tomas Krizek committed Feb 25, 2022

By default, filter out queries for subdomains of dotnxdomain.net.
This is a 'special' measurement domain. Queries directed to it have
timestamps encoded in qname and replaying old queries results in
timeouts, not in a realistic traffic replay.

A new option -s can be used to keep the queries in the output if
desired.

The other domain - dashnxdomain.net - did not appear in any of my PCAPs
so for simplicity I omitted it from the filtering code.

Fixes: #25