Removed the hack that used typecast to get rid of const by using local
variables that are allocated and freed. Fix couple of memory leaks
and check that the required Ifname parameter is included.
The D-Bus interface does not really have anything to do with the
wpa_supplicant ctrl_iface interface and as such, this prefix in
dbus files is both confusing and unnecessarily. Make the file names
shorter by removing this prefix.
