[9.20] chg: test: Log dnspython queries after .to_wire() is called

Some dns message modifications like TSIG happen only after .to_wire() is
called on the message. To ensure there isn't a discrepancy between what
has been logged and what has been sent, log the query after
dns.query.udp() is executed (which calls .to_wire() on the message).

Backport of MR !11623

Merge branch 'backport-nicki/pytest-log-querymsg-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!11642