examples/l3fwd-power: support virtio/vhost
examples/l3fwd-power: support virtio/vhost

In l3fwd-power, there is default port configuration which requires
RSS and IPv4/UDP/TCP checksum. Once device does not support these,
the l3fwd-power will exit and report an error.
This patch updates the port configuration based on device capabilities
after getting the device information to support devices like virtio
and vhost.

Signed-off-by: Miao Li <c087f9bd6b3c55b0e13ad875578ec4da82085902@intel.com>
Reviewed-by: Chenbo Xia <5d298a4585cd22ca5d29de25967a5599c4c324c8@intel.com>
Acked-by: David Hunt <763be7c8e0ad91e03160e7aed76d5cd41534e2f9@intel.com>

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