test: add flow classify unit tests

test: add flow classify unit tests

Add flow_classify_autotest program.

Set up IPv4 ACL field definitions.
Create table_acl for use by librte_flow_classify API's.
Create an mbuf pool for use by rte_flow_classify_query.

For each of the librte_flow_classify API's:
test with invalid parameters
test with invalid patterns
test with invalid actions
test with valid parameters

Initialise ipv4 udp traffic for use by the udp test for
rte_flow_classifier_run.

Initialise ipv4 tcp traffic for use by the tcp test for
rte_flow_classifier_run.

Initialise ipv4 sctp traffic for use by the sctp test for
rte_flow_classifier_run.

Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
Acked-by: Jasvinder Singh <jasvinder.singh@intel.com>