presence-manager: stop watching connectivity changes
presence-manager: stop watching connectivity changes

Mission-Control does it for us now (thanks Will!).

We don't remove empathy-connectivity yet because some Empathy components still
rely on it to display the status of the network. Ideally, this could be
exposed by MC as well (fdo #45126).

https://bugzilla.gnome.org/show_bug.cgi?id=668498

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets