2.4.0 sanity test result

Below fixes are included.

* modify drawers pointer-event property for preventing to pass the mouse event
* remove position: property in Spinner.less to extended spinner's postion works well
* add initial array to prevent empty drawers makes error(in this.drawers.lengh)

Enyo-DCO-1.1-Signed-off-by: Sungbae Cho sb.cho@lge.com