Merge branch 'tunnel-shinfo'

Antoine Tenart says:

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net: do not modify the shared tunnel info when PMTU triggers an ICMP reply

The series fixes an issue were a shared ip_tunnel_info is modified when
PMTU triggers an ICMP reply in vxlan and geneve, making following
packets in that flow to have a wrong destination address if the flow
isn't updated. A detailled information is given in each of the two
commits.

This was tested manually with OVS and I ran the PTMU selftests with
kmemleak enabled (all OK, none was skipped).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>