Update Dockerfile to use Fedora 26
Update Dockerfile to use Fedora 26

product-definition-center/product-definition-center,release-engineering/product-definition-center,product-definition-center/product-definition-center,product-definition-center/product-definition-center,release-engineering/product-definition-center,product-definition-center/product-definition-center,release-engineering/product-definition-center,release-engineering/product-definition-center