cleanup ifid selection.  we no longer cache EUI64 (KAME PR 236). IN6_IFT_xx are now obsolete (IFT_xx and IFF_xx do the same thing).
cleanup ifid selection.  we no longer cache EUI64 (KAME PR 236).
IN6_IFT_xx are now obsolete (IFT_xx and IFF_xx do the same thing).

in6_ifattach_getifid() calls should be nuked.
will change in6_ifattach() function signature since it has so many
obsoleted args.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame