Split the GetSecrets() call off to a separate D-Bus interface so that it
	can be more easily locked down with D-Bus policy.  Only 'root' (ie, NM)
	should be able to call GetSecrets().

	* include/NetworkManager.h
		- Define the connection secrets D-Bus interface

	* src/vpn-manager/nm-vpn-connection.c
		- (clear_need_auth): get the right proxy object for the connection
			secrets interface
		- (get_connection_secrets): use the connection secrets proxy; send
			empty hints in get secrets request

	* src/nm-activation-request.c
		- (nm_act_request_request_connection_secrets): use the connection
			secrets proxy; send empty hints in get secrets request

	* src/nm-manager.c
	  src/nm-manager.h
		- (connection_get_settings_cb): set the connection secrets proxy on
			the connection object too
		- (internal_new_connection_cb): create the connection secrets proxy

	* introspection/nm-settings-connection.xml
		- Define Connection.Secrets interface and move GetSecrets there
		- Add a 'hints' argument to GetSecrets

	* libnm-glib/nm-settings.c
	  libnm-glib/nm-settings.h
		- (impl_connection_settings_get_secrets): add 'hints' argument



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@2989 4912f4e0-d625-0410-9fb7-b9a5a253dbdc