Hiroki Sato f6e5ba31d2 Fix several glitches in IPv6-related knobs:
- ipv6_enable + ipv6_gateway_enable should unset ACCEPT_RTADV by default for
  backward compatibility.

- Configurations in ipv6_prefix_IF should be recognized even if there is no
  ifconfig_IF_ipv6.

- DAD wait should be performed at once, not on a per-interface basis, if
  possible.  This fixes an issue that a system with a lot of IPv6-capable
  interfaces takes too long for booting.

MFC after:	1 week
2012-01-22 10:57:32 +00:00
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rpc
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