KVMD 2.3: Workaround for dhcpcd crashes

A problem was found in the distro due to which the new dhcpcd (client) crashes when trying to get a Wi-Fi address (it's not me!).

So that you don't get a broken KVM after random update, in this release I forced the use of dhclient instead of dhcpcd. You should not notice any changes or problems. If there is anything strange, please let me know.

Now about pleasant things.

• Added support for IPMI Serial-over-LAN. Now you can use ipmitool to access your server's console on the hardware COM port, see here for information.

• Added the ability to edit streamer options without having to copy the entire list to /etc/kvmd/override.yaml. Now you can write something like:

kvmd:
    streamer:
        cmd_append: [--slowdown]

The other features I'm currently working on are in experimental mode. Due to the urgency of the release, I didn't have time to finish it. But I will soon :)