Fix bug with dig returning CNAME records for PIA domains

[warhuhn]

The ip command after the " * Accept output traffic to VPN server $ip through $INTERFACE, port $PROTOCOL $PORT..." message failed because dig returned a CNAME record at the first position for me.

So i just filtered the domain name records from the dig output with grep.

The original plan was to tell the dig command to only return A-Records but there's no such option.

[mweimer]

* Creating VPN rules
iptables v1.6.1: host/network 'us-chicago.regions.cluster.piaservers.net.' not found
Try 'iptables -h' or 'iptables --help' for more information.
   * Accept output traffic to VPN server us-chicago.regions.cluster.piaservers.net. through eth0, port udp 1197...[ERROR] Undefined error, with status

I was having this error whenever I tried to start the container. The PR fixed it. Thanks!

[warhuhn]

Already resolved with 986f26c