Fix checking for custom metadata on controller node
Fix checking for custom metadata on controller node

crowbar command is only available at admin server, but this method is
run on controller node

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