MFC 287094:

- Deprecate IN6_IFF_NODAD.  It was used to prevent DAD on a loopback
  interface but in6if_do_dad() already had a check for IFF_LOOPBACK.

- Remove in6if_do_dad() check in in6_broadcast_ifa().  An address
  which needs DAD always has IN6_IFF_TENTATIVE there.

- in6if_do_dad() now returns EAGAIN when the interface is not ready
  since DAD callout handler ignores such an interface.

- In DAD callout handler, mark an address as IN6_IFF_TENTATIVE
  when the interface has ND6_IFF_IFDISABLED.  And Do IFF_UP and
  IFF_DRV_RUNNING check consistently when DAD is required.

- draft-ietf-6man-enhanced-dad is now published as RFC 7527.

- Fix some typos.

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