This was previously done by storing the value inside the WirelessSecurity class.
This stopped the subclasses from becoming Gtk widgets.
The "always_ask" code was removed as it didn't seem to actually retain when
switching. This might need to be fixed at a later time.
This code is fairly independent of the rest, and we don't want
net-device-wifi.c to become too massive and unmaintainable.
The code in connection-editor/ is fairly similar to
nm-connection-editor, with some simplification because we
currently only edit wireless connections.
The code in wireless-security/ is almost a straight copy
of the same code in nm-connection-editor, with some changes
to the .ui files to make them fit better in the new design.
