@Override
    public void validate(ChangeContext context) {
        findServicesWithChangedStartupCommand(context.previousModel(), context.model()).forEach(context::require);
    }
Compares the startup command for the services in the next model with the ones in the current model.
If the startup command has changes, a change entry is created and reported back.

@author bjorncs
config-model/src/main/java/com/yahoo/vespa/model/application/validation/change/StartupCommandChangeValidator.java