mkcloud: move hdd size variables to be with other user-tweakable params
mkcloud: move hdd size variables to be with other user-tweakable params

SUSE-Cloud/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,vmoravec/automation,aspiers/automation,aspiers/automation,vmoravec/automation,gosipyan/automation,vmoravec/automation,aspiers/automation,SUSE-Cloud/automation,vmoravec/automation,gosipyan/automation,gosipyan/automation