[TASK] Add calling of PostDefault callback at parameter load

For some objects an action could be required after loading
default values. The new event kEplObdEvPostDefault
is used for this purpose.

Change-Id: Iebb8b2ba497c507ad89413f01fb818021d18a01d
Reviewed-on: http://brateggevoat1/gerrit/444
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>