Suggestion from Bill Moss:
	* src/NetworkManagerSystem.c
		- (nm_system_device_set_up_down_with_iface): ignore ENODEV


	* src/NetworkManager.c
		- (nm_data_free): move destruction of the various managers after
			release of device list, because deactivating and freeing a device
			requires at least the named manager
		- (nm_poll_and_update_wireless_link_state):
		  (nm_device_link_activated):
		  (nm_device_link_deactivated):
			don't grab the device list lock when actually updating device
			link status or strength, since nm_device_set_link_active()
			needs to call nm_get_active_device(), which also locks the device list.

	* src/NetworkManagerDevice.c
		- (nm_device_set_link_active): if a device's link switches from off->on,
			and it's wired, and the active device is wireless (or there is no
			active device), activate the new device whose link just came on
		- (link_to_specific_ap): try to smooth over intermittency in wireless links
			my only calling the link to the current ap "failed" when more than 2
			consecutive link checks have failed


git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@606 4912f4e0-d625-0410-9fb7-b9a5a253dbdc