crowbar-prep.sh: add missing dependency of D:C:3:S on D:C:3
crowbar-prep.sh: add missing dependency of D:C:3:S on D:C:3

Devel:Cloud:3:Staging only provides a subset of Devel:Cloud:3, so
-s requires adding Devel:Cloud:3 too.

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