dhcpcd-4.0.0-alpha1 ready for review

[Roy Marples <roy%marples.name@localhost>]

OK, some people seem to be genuinely excited about dhcpcd, and others not so 
much. So, here's a first draft of dhcpcd-4 :)
You can download a tarball here.
http://roy.marples.name/dhcpcd/dhcpcd-4.0.0-alpha1.tar.bz2

It supplies /etc/dhcpcd.sh which works in pretty much the same way as 
dhclient-script. It will configure resolv.conf, ntp.conf, yp.conf and restart 
any services for them if it needs to. All variable names that dhclient 
emitted are also emitted to dhcpcd.sh so existing customisations stand a good 
chance of working.

Interface and routing setup is still done in dhcpcd itself. dhcpcd binary is 
now 46k (40k stripped) on NetBSD-4/i386.

New $reason TEST and IPV4LL are emitted.

Stuff that needs to be done
Create man page for dhcpcd.sh
Export classless static routes (option 121) to dhcpcd.sh
Testing! Especially that the correct $reason is set.
Review dhcpcd.sh and ensure that all funtions can be overridden by hook 
scripts.

Thanks

Roy