ipvs: Add generic ensure_mtu_is_adequate to handle mixed pools

The out_rt functions check to see if the mtu is large enough for the packet
and, if not, send icmp messages (TOOBIG or DEST_UNREACH) to the source and
bail out.  We needed the ability to send ICMP from the out_rt_v6 function
and DEST_UNREACH from the out_rt function, so we just pulled it out into a
common function.

Signed-off-by: Alex Gartrell <[email protected]>
Acked-by: Julian Anastasov <[email protected]>
Signed-off-by: Simon Horman <[email protected]>

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