app/testpmd: add meter to flow actions table

app/testpmd: add meter to flow actions table

Since METER action is supported by the testpmd application
suitable entry should exist in flow actions information table.

Without that testpmd will return error on adding a new flow to
the list of flows attached to a given port.

Fixes: 30ffb4e67ee3 ("app/testpmd: add commands traffic metering and policing")
Cc: stable@dpdk.org
Signed-off-by: Tomasz Duszynski <tdu@semihalf.com>
Acked-by: Jasvinder Singh <jasvinder.singh@intel.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>