Skip changes generation when tar_scm does it already
Skip changes generation when tar_scm does it already

Search for a tar_scm service that has a "changesgenerate" tag. Actually
it should check if it has the content "enabled", but that heavily
depends on the XPath capabilities of Perl, which I don't know.

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