net/igb: parse flow API ethertype filter
net/igb: parse flow API ethertype filter

check if the rule is a ethertype rule, and get the ethertype info.

Signed-off-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk