MFC r272770:
  When tunneling interface is going to insert mbuf into netisr queue after stripping
  outer header, consider it as new packet and clear the protocols flags.

  This fixes problems when IPSEC traffic goes through various tunnels and router
  doesn't send ICMP/ICMPv6 errors.

PR:		174602
Sponsored by:	Yandex LLC
Merge remote-tracking branch 'freebsd/stable/10' into hardened/10/aslr