LibBSD /etc/rc.conf changes

[Chris Johns]

Hi,

The implementation I added to LibBSD parses the rc.conf file and invokes 
handers for each directive in the file. The approach has exposed a few 
issues and I have decided to re-implement the code to better follow the 
FreeBSD approach.

Specially the network start up automatically sets up the lo0 interface. 
With DHCP initialisation waits defaultroute_delay seconds for the 
default route to be set before moving on once all interfaces are set up. 
These cannot be implemented with the current way the rc.conf parsing is 
done.

Chris