libvirt-daemon-driver-interface from home:olh:xen-4.19 project

For SLE 15 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:olh:xen-4.19/SLE_15/home:olh:xen-4.19.repo
zypper refresh
zypper install libvirt-daemon-driver-interface