Rework VPN connection handling for a more consistent D-Bus API.  The
	VPNManager object has been removed, and active VPN connections are now the
	same as any other active connection.  The Manager object's ActivateConnection
	and DeactivateConnection methods are used to start and stop a VPN connection,
	and the VPNConnection objects are subclasses of the ActiveConnection objects.
	When activating a VPN connection, pass the path of the active connection
	to which the VPN connection is tied in the 'specific_object' argument.

	Consequently, the libnm-glib API has been reworked to match this arrangement,
	with the VPNManager object removed, and the NMVPNConnection objects now
	being subclasses of NMActiveConnection.



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@3504 4912f4e0-d625-0410-9fb7-b9a5a253dbdc