Re-enable validate-site-xml.
Re-enable validate-site-xml.



Former-commit-id: df94b9cafdd72f0170cc9bcdab628d7a62095017
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine