Add xenctrl.0.9.26

Signed-off-by: David Scott <dave.scott@citrix.com>
xenctrl/descr: s/xen/Xen/g

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #2682 from djs55/xenctrl.0.9.26

Add xenctrl.0.9.26