tools/xenstore: add error indicator to ring page

tools/xenstore: add error indicator to ring page

In case Xenstore is detecting a malicious ring page modification (e.g.
an invalid producer or consumer index set by a guest) it will ignore
the connection of that guest in future.

Add a new error field to the ring page indicating that case. Add a new
feature bit in order to signal the presence of that error field.

Move the ignore_connection() function to xenstored_domain.c in order
to be able to access the ring page for setting the error indicator.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>