use e_client_layer_set api for client stack change

use e_client_layer_set api for client stack change

if it has only purpose for changing the evas obj layer(such as ibar
   effect animation temporarily, or quickpanel mover generation)
use evas_object_layer_set, but if it is about the client layer policy change
use e_client_layer_set api. because it handles the exception of
layer_pending and layer_block.

Change-Id: I5d25b4ec15d9f3ba4ce10ad467d60ee74733f1c2