Some work on the Slirp DHCP support
- removed obsolete local variables that made the hostname and bootfile options fail
- store requested hostname as a string to simplify the code
- check free space while processing the parameter list
- setting the max. DHCP message size is not supported yet (send error to log)


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12266 6c8e4198-a580-4521-a02f-c9ae86df1db9