* sys/netinet/icmp6.h: synchronize some of declarations, like RA packet   header structure and value #defines with 2292bis-02.
* sys/netinet/icmp6.h: synchronize some of declarations, like RA packet
  header structure and value #defines with 2292bis-02.

* netbsd: synchronize with netbsd-current change to cloning routes.
  (1) cloning routes will be marked with RTF_CLONED.  (2) RTF_CLONED
  routes go away when RTF_CLONING routes go away (= ARP cache goes away
  when interface address goes away)  (3) permit overwrite of RTF_CLONED
  by static route settings.

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