In addition to simplifying a bunch of places that were calling
nm_remote_settings_list_connections() +
nm_device_filter_connections(), this also ensures we filter out slave
connections everywhere (except when they are the active connection).
https://bugzilla.gnome.org/show_bug.cgi?id=677145
Bond, bridge, and VLAN devices may not actually exist until their
connections are brought up. So for those types, create device items
(of type NetVirtualDevice or a subclass) as soon as we see the
NMConnection, and then watch for the NMDevice being added later.
https://bugzilla.gnome.org/show_bug.cgi?id=677145
A source file with 4k lines of code is not understandable, and the glade file
was becoming quite a challenge for glade.
To add more features we need to split things up just to keep them maintainable.
This is the first patch that just splits out the proxy bits. Other device types
will follow in the next few days.
