ENYO-2263: Fix loading issues of Model.defaults properties in the Designer

Ready for review.

Summary:
. add resetInformation() function; load defaults (filterLevel) for properties/events into Model.info. This prevents Model.info undefined issue.
. remove the irrelevant code (i.e getFlattenedContainerInfo)

Enyo-DCO-1.1-Signed-off-by: Marie-Antoinette de Bonis-Hamelin (Marian)
marie-antoinette.de-bonis-hamelin@hp.com