Fixed a typo in user output.

Added a call to rc.ifplugd to start it on the hardwired interfaces (and a floating usb0
interface).

Signed-off-by: The Doctor <drwho@virtadpt.net>
Added `-C resolv.conf` to the evocation of dhcpcd so it won't update the /etc/resolv.conf
file when it gets a lease.

Added code to ifplugd.action to add 7 public DNSes to /etc/resolv.conf after dhcpcd gets a
lease.  This is so that mesh nodes can properly resolve hostnames to IP addresses when there
is a gateway.

There are a couple of false starts that are commented out which will be deleted after this
particular boondoggle gets ironed out.

Signed-off-by: The Doctor <drwho@virtadpt.net>
Deleted the commented-out bits.

Added a short delay between adding nameservers to resolv.conf and propagating them through
the mesh with avahi-daemon.

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