eve-log: swap ip/port pairs in dns answers

Swap ip/port pairs in dns answer eve jon logs.

The PR script didn't produce proper output due to a password change, but here's the URLs for the buildbot output.

https://buildbot.suricata-ids.org/builders/decanio/builds/17
https://buildbot.suricata-ids.org/builders/decanio-pcap/builds/4