modify: check if value is changed

modify: check if value is changed

In modify dialog, do check value is changed and
enable confirm button.
(Device-template is not applied yet)

ItemListComp receive value and clone it.
Received value is old-value, cloned value is new-value.
So it doesn't need to clone before create dialog.

Change-Id: I825530f50aacd67c4210f10083cadda47d9860d5
Signed-off-by: minkee.lee <minkee.lee@samsung.com>