Created an ifplugd.action script that should do what we want when we set up a gateway.

Created what looks like a sane set of configs for ifplugd.

Replaced the network interface detection code in rc.ifplugd that ignores wireless interfaces.

Added a new olsrd.conf file from Commotion's repository.

Commented out all of the evocations of dhcpcd in rc.inet1.

Signed-off-by: The Doctor <drwho@virtadpt.net>
Added usb0 to the list of interfaces that ifplugd will monitor for a link.

Signed-off-by: The Doctor <drwho@virtadpt.net>