Also change the signature of the NM_SUPPLICANT_INTERFACE_STATE signal,
to have three "int" type arguments. Thereby also fix the subscribers
to this signal that wrongly had type guint32, instead of guint
(which happens to be the same underlying type, so no real problem).
https://mail.gnome.org/archives/networkmanager-list/2017-February/msg00021.html
As the fast-supported flag changes, update the existing supplicant
interfaces with the new information.
Also, by default assume it is supported.
(cherry picked from commit 872b9ec5ea)
