Patch from Dave Woodhouse:
	* src/NetworkManagerSystem.h
	  src/backends/NetworkManagerDebian.c
	  src/backends/NetworkManagerGentoo.c
	  src/backends/NetworkManagerSlackware.c
		- New nm_system_device_add_ip6_link_address() function to add link-local
			address on an interface.  Stubbed in Debian, Gentoo, and Slackware.

	* src/backends/NetworkManagerRedHat.c
		- (nm_system_device_add_ip6_link_address): implement
		- (nm_system_device_flush_addresses): revert to previous behavior of
			flushing all addresses


git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@432 4912f4e0-d625-0410-9fb7-b9a5a253dbdc