Config scripts take a machine name for c89

Without arguments, both scripts will continue to config for qemu.

When you're on c89 will config for that machine.  It'll only config c89's first
NIC to appear as c96.  We also have c97 available for the second NIC, if we
want.

$ ash ifconfig c89
	or
$ ash root c89
Fixes tcpackproc's kname

Can't use the space on the stack, since the ktask is async.

We could start having ktask() kstrdup the string.  Though either way, the ktask
will need to free when it's done.