ENYO-2799: Disabled serialization of "value" property for onyx.DatePicker and onyx.TimePicker
ENYO-2799: Disabled serialization of "value" property for onyx.DatePicker and onyx.TimePicker

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>

enyojs/onyx,mcanthony/onyx,mcanthony/onyx,enyojs/onyx