Rewrite of the DHCP option handling including support for a parameter list,
host name, lease time and other options (ported from Bochs 'vnet' DHCP server).


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12265 6c8e4198-a580-4521-a02f-c9ae86df1db9