Merge the vpn-properties setting with the vpn setting since it was pointless
to keep both of them around. Convert the vpn 'data' hash table to a hash
of string:string (instead of string:variant) so that system settings plugins
can have an easier time dealing with the arbitrary key/value pairs.
git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@3923 4912f4e0-d625-0410-9fb7-b9a5a253dbdc
10661abe17