Create a path MTU host route for IPsec over IPv6. Basically the

code is copied from IPv4 and adapted.  Some things are changed in
v4 to make it look similar.
- ip6_forward increases the noroute error counter, do that in
  ip_forward, too.
- Pass more specific sockaddr_in6 to icmp6_mtudisc_clone().
- IPv6 may also use reject routes for IPsec PMTU clones.
- To pass a route_in6 to ip6_output_ipsec_send() introduce one in
  ip6_forward().  That is the same what IPv4 does.  Note
  that dst and sin6 switch roles.
- Copy comments from ip_output_ipsec_send() to ip6_output_ipsec_send()
  to make code similar.
- Implement dynamic IPv6 IPsec PMTU routes.
OK tobhe@

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