app/testpmd: add new command for show port info

app/testpmd: add new command for show port info

existing testpmd command "show port info" is too verbose.
Added a new summary command to print brief information on ports.

console output:
	testpmd> show port summary all
	Number of available ports: 2
	Port MAC Address       Name          Driver   Status Link
	0    11:22:33:44:55:66 0000:07:00.0  net_i40e  up    40000Mbps
	1    66:55:44:33:22:11 0000:07:00.1  net_i40e  up    40000Mbps

Signed-off-by: Emma Finn <emma.finn@intel.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>