For user who want to get the number of device ports on system,
better to get it from rte_eth_dev_count function in rte_ethdev.h
But while a Go application include this rte_ethdev.h header and
nff-go library will cause a RTR_HASH error.
See https://github.com/intel-go/nff-go/issues/649 for detail
information about the error message.
Signed-off-by: Yu-Han Lin guesslin@glasnostic.com