app/flow-perf: support meter policy API

app/flow-perf: support meter policy API

Add option "policy-mtr" to indicate if meter creation will include policy
or not. Meter creation will keep unchanged without it.

With "policy-mtr", the policy is introduced. API create_meter_policy
is to create a policy. API create_meter_rule will use it to create
a meter. The value of it is used to specify meter policy actions.

Signed-off-by: Haifei Luo <haifeil@nvidia.com>
Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Signed-off-by: Rongwei Liu <rongweil@nvidia.com>
Acked-by: Wisam Jaddo <wisamm@nvidia.com>