Use arp -an in freenas-debug
In 11.1-U7, on a pre-production TrueNAS we were handed DNS IP addresses that were not working.
Since the TrueNAS was configured to use this DNS servers, this showed that arp -a was taking a LONG time to run.
This caused the freenas-debug process from completing on the passive controller. This ticket is to change the arp -a command to arp -an so it only prints numeric IP addresses and stops trying to use the configured DNS servers.