in6_addrscope(): treat the loopback address as global, because there is no ambiguity about scoping.  Otherwise, we'd see ::1%ID (ID != 0) via scope6_addr2default(). (I'm still not sure if this change is really safe.  We should take care of the new behavior)
in6_addrscope(): treat the loopback address as global, because there is no
ambiguity about scoping.  Otherwise, we'd see ::1%ID (ID != 0) via
scope6_addr2default().
(I'm still not sure if this change is really safe.  We should take care of
the new behavior)

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