xenbus: advertise control feature flags

xenbus: advertise control feature flags

The Xen docs specify several flags which a guest can set to advertise
which values of the xenstore control/shutdown key it will recognize.
This patch adds code to write all the relevant feature-flag keys.

Based-on-patch-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
OraBug: 25497392

(cherry picked from commit 44b3c7af02ca2701b6b90ee30c9d1d9c3ae07653)
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>