The pf code marks ICMP packets belonging to an TCP or UDP divert

The pf code marks ICMP packets belonging to an TCP or UDP divert
state as diverted.  This is necessary for IP input to accept the
packet as ours.  But it must not be used to match the ICMP packet
to a raw socket.  Clear the PF_TAG_DIVERTED mbuf pf flag for the
special ICMP and ICMP6 packets in icmp_input_if() and icmp6_input().

The m_tag_delete_chain() caused an inconsistent PF_TAG_DIVERTED
mbuf pf flag and PACKET_TAG_PF_DIVERT mbuf tag which triggered an
assert in rip_input().  Deleting all mbuf tags can have undesired
side effects and is not necessary anymore since icmp_reflect() calls
m_resethdr().  Do not touch the mbuf tags and adjust the mbuf pf
flags for the correct behavior of rip_input() and rip6_input().

reported by Chris Eidem, James Turner, vicviq, Scott Vanderbilt
OK mpi@