qmicli,wds: implement '--wds-get-packet-statistics' command

E.g.:
    $ sudo qmicli -d /dev/cdc-wdm0 --wds-get-packet-statistics
    [/dev/cdc-wdm0] Connection statistics:
    	TX packets OK: 552
    	RX packets OK: 466
    	TX bytes OK: 108849
    	RX bytes OK: 187837

The output will ignore those stat values which are unsupported by the device.
1 file changed