xl: allow domid to be preserved on save/restore or migrate

xl: allow domid to be preserved on save/restore or migrate

This patch adds a '-D' command line option to save and migrate to allow
the domain id to be incorporated into the saved domain configuration and
hence be preserved.

NOTE: Logically it may seem as though preservation of domid should be
      dealt with by libxl, but the libxl migration stream has no record
      in which to transfer domid and remote domain creation occurs before
      the migration stream is parsed. Hence this patch modifies xl rather
      then libxl.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>