Implement config handling (send/receive)

[tyler-sommer]

Ref #29

The plan is to actually define a new "hardware kind" for OpenWrt-based configurations that leverages UCI directly. The existing linux_generic hardware kind will get a simple key value format, lines delimited by newlines, key=val format.

For each supported linux_generic platform, additional integration that actually applies the necessary system changes when requested will be required. Initially, we'll stick to the current Debian flavoring and have a systemd integration for the unum-aio package. Additional thought needs to be placed into how this affects the "manual" commands in minim-config (used in the Docker install).

[tyler-sommer]

Landed in #36 👍