Fix MAC address search problem with fragmentation.
Fix MAC address search problem with fragmentation.

Do not write to odata->gw in ofp_ip_output_add_eth() when adding ethernet
header since other fragments of the same packet reuse odata and zero
odata->gw tells ofp_ip_output_add_eth() that the destination is directly
on the connected link.

Signed-off-by: Janne Peltonen <184f24496cb678cb2ae7fb0b4232a4cbe2bea47a@nokia.com>
Reviewed-by: Valentin Radulescu <5c0267d222138450b4835b40b746ecdf0117cfc8@enea.com>

OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp