xen packages up for test

[Guido Günther <agx@sigxcpu.org>]

Hi,
credativ put updated xen packages to fix XSA-214, XSA-215, XSA-200
(CVE-2016-9932) and CVE-2017-7995 here:

    https://korte.credativ.com/~fge/xen/

If you run xen it would be great to see if it works for you too.
Cheers,
 -- Guido