network: remove trailing spacing when setting HWADDR for ifcfg-p2p0 for NetworkManager to parse it correctly

postplug.d/20network

@@ -152,7 +152,7 @@ for net_int in $(cat /proc/net/dev | sed -n '/p2p[0-9]*:/{s,:.*,,;p}'); do
       P2P_HWADDR=`ifconfig $net_int | grep HWaddr | sed "s|.* HWaddr ||"`
       cat > $network_devices/ifcfg-${net_int} << _EOF
 DEVICE=$net_int
-HWADDR=$P2P_HWADDR
+HWADDR=${P2P_HWADDR:0:17}
 ONBOOT=no
 NM_CONTROLLED=no
 _EOF