net/failsafe: fix source port id in Rx packets

net/failsafe: fix source port id in Rx packets

When passed to the application, Rx packets retain the port ID value
originally set by slave devices. Unfortunately these IDs have no
meaning to applications, which are typically unaware of their existence.

This confuses those caring about the source port field in mbufs
(m->port) which experience issues ranging from traffic drop to crashes.

Fixes: a46f8d584eb8 ("net/failsafe: add fail-safe PMD")
Cc: stable@dpdk.org
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Acked-by: Gaetan Rivet <gaetan.rivet@6wind.com>