Import the DHCPv6 relay implementation.

This code was based on the dhcrelay(8) daemon and shares a lot of the
structures and functions. This daemon implements the following RFCs:
* RFC 3315 Section

Import the DHCPv6 relay implementation.

This code was based on the dhcrelay(8) daemon and shares a lot of the
structures and functions. This daemon implements the following RFCs:
* RFC 3315 Section 20: Relay Agent Behavior
* RFC 4649: Relay Agent Remote-ID option
* RFC 6221: Lightweight DHCPv6 Relay Agent

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