As struct rte_tm_shaper_params defined, the command line of
testpmd should include committed and peak parameters, but
right now the command line doesn't identify whether it's
committed or peak parameter. This patch identifies and
adds the clarify definition
Fixes: bddc2f40b594 ("app/testpmd: add commands for shaper and wred profiles")
Cc: stable@dpdk.org
Signed-off-by: Rosen Xu <rosen.xu@intel.com>