Set hostname with FQDN

[DJ Lucas]

Following on from #2364, /etc/sysconfig/network should contain a fully qualified domain name now that /bin/hostname supports it...that is assuming that it correctly sets domainname and hostname in /proc/sys/kernel. I also notice that a few old switches (-h, --host, and --domainname), as well as the DECnet support, have been removed in comparison to the really old one from net-tools. Be on the lookout for scripts that test only for -f and then use switches that might not exist.