Opclass

Tested with last wpa_supplicant implementation and ath9k open source driver. In case we use channels = 0 and not set op_class (for HT20) wpa_supplicant will not perform scan.

I have test case that check this: ` status, buf = ap.execute(['ubus', 'call', line, 'request_neighbor', neigh_str]) if status != 0: raise Exception("Could not request_neighbor")

        # check if supplicant started new scan
        ev = wpas.wait_event(["CTRL-EVENT-SCAN-RESULTS"], timeout=10)
        if ev is None:
            raise Exception("wait event")

        # TODO check AP side if we get results

`