kern/143666: [ip6] [request] PMTU black hole detection not implemented

[Arifumi Matsumoto]

Hi,

I made a patch for 8.0 release to fix this issue of path-mtu blackhole
detection.
This was mostly derived from macosx, which is APSL and BSD
dual-licensed code base,
and slightly modified so that it should not affect ipv4 path mtu detection.

I tested it on 8.0 release only.
I'm guessing this can be applied for CURRENT also, as the related code does not
seem to be changed that much.

Best regards,
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