Enhancement: Apply Network Configuration Dynamically Based on Active Interfaces

[apmarshall]

Currently, we are applying our DNS settings to the interfaces Wi-Fi and Ethernet based on which are present. Those might not be the only interfaces (ie, newer Macs without a dedicated ethernet port can have a USB-bridged ethernet connection, and that apparently shows up differently). Would like to modify that procedure to first enumerate the available interfaces, then apply to DNS config to each one it finds.