python3-lxml from home:deneb_alpha:grafana-test project

需要 SLE 12 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:deneb_alpha:grafana-test/SLE_12/home:deneb_alpha:grafana-test.repo
zypper refresh
zypper install python3-lxml