Bug#929129: Xen Hypervisor security update for Intel MDS - XSA 297

[Wiebe Cazemier]

Package: xen-hypervisor-4.8-amd64
Version: 4.8.5+shim4.10.2+xsa282-1+deb9u11

All Xen Hypervisor packages also need patches against the Intel MDS bug,
same as https://www.debian.org/security/2019/dsa-4444.

http://xenbits.xen.org/xsa/advisory-297.html