Use dedicated etter.mdns file for mdns_spoof plugin to avoid
warnings printed out by mdns_spoof plugin when parsing the etter.dns
file and meets record types not supported by mdns_spoof plugin but
supported by dns_spoof plugin.
fix some typos in etter.dns and etter.mdns
Merge pull request #222 from koeppea/master

Fix for issue #216 "unknown records"