api: mention XEN as well as KVM in the API

Signed-off-by: David Scott <dave.scott@citrix.com>
Mention XEN as well as KVM

Signed-off-by: David Scott <dave.scott@citrix.com>
Transform more (if kvm) into (if kvm || xen)

Signed-off-by: David Scott <dave.scott@citrix.com>
Add router.template.libvirtxen

This avoids clashing with router.template.xen, used by XenServer.

Signed-off-by: David Scott <dave.scott@citrix.com>
Rename KVM to XEN to see if more will work (THESE ARE HACKS)

Signed-off-by: David Scott <dave.scott@citrix.com>
Transform (if kvm) into (if kvm || xen)

Signed-off-by: David Scott <dave.scott@citrix.com>