- Pullup even when the extention header is unknown, to prevent   infinite loop with net.inet6.ip6.fw.deny_unknown_exthdrs=0. - Teach ipv6 and ipencap as they appear in an IPv4/IPv6 over IPv6   tunnel. - Test the next extention header even when the routing header type   is unknown with net.inet6.ip6.fw.deny_unknown_exthdrs=0.
- Pullup even when the extention header is unknown, to prevent
  infinite loop with net.inet6.ip6.fw.deny_unknown_exthdrs=0.
- Teach ipv6 and ipencap as they appear in an IPv4/IPv6 over IPv6
  tunnel.
- Test the next extention header even when the routing header type
  is unknown with net.inet6.ip6.fw.deny_unknown_exthdrs=0.

Found by:	xcast-fan-club
MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase