Merge branch 'netdev_modified'

Nicolas Dichtel says:

====================
rtnl: send notification in do_setlink()

This series ensures to call the notifier chain and to send a netlink
message when a change is done by do_setlink().

The three first patches mainly prepare the last one, which do this change.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>