Added broadcast IP address and server name "slirp" to DHCP reply.
TODO: port more features from the Bochs 'vnet' DHCP server to Slirp.


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12261 6c8e4198-a580-4521-a02f-c9ae86df1db9