Make Gaussino LHCbApp dependent when used with Gauss
as discussed with @clemenci
This will fix the errors showing up when IOHelper via LHCbApp (still used by Gauss-on-Gaussino) implictly sets the default configurables before the configuration of Gaussino is applied. For example, Gaussino sets up HiveWhiteBoard
that has to be instatiated with the same name as EventDataSvc
leading to the following error:
AttributeError: Configurable 'EvtDataSvc' does not have property 'EventSlots'.