[Toybox] [PATCH] dhcpd add -6 option(ipv6 support)

[Yeongdeok Suh]

I added dhcpd -6 option.

It's for supporting ipv6, and I referred to RFC 3315 Specification
http://www.rfc-base.org/txt/rfc-3315.txt

There are some different kind of requests in dhcpd6,
but I inplemented only a basic protocol. (Solicit - Advertise - Request -
Reply)
There's a sample packet as below. toybox dhcpd works in the same way.
http://packetlife.net/captures/DHCPv6.cap

PFA for the patch.
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