Add a simple dhcp client for rump kernels. It uses code from dhcpcd
for talking to the server and for setting the interface address
and route. However, otherwise it is quite different, since we nee

Add a simple dhcp client for rump kernels. It uses code from dhcpcd
for talking to the server and for setting the interface address
and route. However, otherwise it is quite different, since we need
to be working under the assumptions that there is no stable storage
on a rump instance, and that there are n networking stacks on a
given host.

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