Avoid update contact model if it is marked as autoUpdate false.

Does not update declarative contact model when the manager change if the property autoUpdate is marked as false.

Change-Id: Ib6fa1ab3dcf127ab6c3ffa9a4c8dbfa91354e35b
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Christopher Adams <chris.adams@jollamobile.com>