dm: trigger change uevent on rename

Insert a missing KOBJ_CHANGE notification when a device is renamed.

Cc: Scott James Remnant <scott@ubuntu.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --cc drivers/md/dm-ioctl.c
Simple merge

diff --cc drivers/md/dm.c
Simple merge

diff --cc drivers/md/dm.h
Simple merge