Add support for single flow dump.
The CLIs to dump one rule: flow dump PORT rule ID
to dump all: flow dump PORT all
Examples:
testpmd> flow dump 0 all
testpmd> flow dump 0 rule 0
Signed-off-by: Haifei Luo <haifeil@nvidia.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>