Add error code to error message
Add error code to error message

For debugging mkcloud failures it might be helpful to have the error
code number (which is hopefully unique) in the error message.

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