app/testpmd: use a structure to store offload info in csum fwd engine
app/testpmd: use a structure to store offload info in csum fwd engine

To simplify the API of parse_* functions, store all the offload
information for the current packet in a structure.

No functional change.

Signed-off-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>
Acked-by: Jijiang Liu <10b95deab7df654d0c21c8c98b54c9a1ecf2a5c0@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk