explicitly use BPF_FILDROP_CAPTURE when configuring BIOCSFILDROP

BIOCSFILDROP used to just be a flag, ie, any non-zero value was
treated the same, but i'm changing it so different values do differen

explicitly use BPF_FILDROP_CAPTURE when configuring BIOCSFILDROP

BIOCSFILDROP used to just be a flag, ie, any non-zero value was
treated the same, but i'm changing it so different values do different
things. this way the programs should keep working even if i decide
to change the values for these macros.

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Switch base tools from /dev/bpf0 to /dev/bpf. Now that /dev/bpf has been
around for two releases, it should be safe to do so.

ok bluhm deraadt sthen tb yasuoka

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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