Testpmd can generate multiple flows without taking much cost and this
could be a simple traffic generator for developer's quick tests.
If "--txonly-multi-flow" is specified in the command line, IP source
address is varied to generate multiple flows.
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>