libvirt-daemon-driver-storage-core from home:olh:testing-xen-unstable project

需要 SLE 15 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:olh:testing-xen-unstable/SLE_15/home:olh:testing-xen-unstable.repo
zypper refresh
zypper install libvirt-daemon-driver-storage-core