Deal with a bunch of dhcp issues, ok fries@:

	- some minor cleanup (syscall return codes, dead code, use strlcpy,
	  etc)
	- sanity check dhcp option values recieved by dhclient
	  so that things that should look like a hostname look like a
	  hostname, and things that should look like an ip address look
	  like an ip address, if they don't ignore the lease
	  offer because it's bogus.
	- Make the dhcp server attempt to ping an address when it recieves
	  a RELEASE from it. If the address answers a ping, ignore the
	  release offer. This helps make spoofing releases to liberate
	  addresses more difficult.

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