all: remove use of struct ether_addr / ether_aton()

Lots of old code used struct ether_addr to store hardware addresses,
and ether_aton() to parse them, but more recent code generally uses
guint8 arrays, and the nm_utils_hwaddr_* methods, to be able to share
code between ETH_ALEN and INFINIBAND_ALEN cases. So update the old
code to match the new. (In many places, this ends up getting rid of
casts between struct ether_addr and guint8* anyway.)

(Also, in some places, variables were switched from struct ether_addr
to guint8[] a while back, but some code still used "&" when referring
to them even though that's unnecessary now. Clean that up.)

src/platform/wifi/wifi-utils.c

@@ -120,12 +120,12 @@ wifi_utils_get_ssid (WifiData *data)
 }
 
 gboolean
-wifi_utils_get_bssid (WifiData *data, struct ether_addr *out_bssid)
+wifi_utils_get_bssid (WifiData *data, guint8 *out_bssid)
 {
 	g_return_val_if_fail (data != NULL, FALSE);
 	g_return_val_if_fail (out_bssid != NULL, FALSE);
 
-	memset (out_bssid, 0, sizeof (*out_bssid));
+	memset (out_bssid, 0, ETH_ALEN);
 	return data->get_bssid (data, out_bssid);
 }