CP-6232: Don't restore the Qemu tail in xenopsd
CP-6232: Don't restore the Qemu tail in xenopsd

We've removed a patch from our Xen patch queue which stopped xc_domain_restore
from restoring the device model record. Therefore, this will now be done by
xenguest and so we don't need to do it in xenopsd.

Aside: xc_domain_restore has been modified to understand suspend images created
before this change (i.e. when xenopsd orchestrated the device model dump).

Signed-off-by: Si Beaumont <a0992b7f1f450b4c7716d34b81a2d6f0877ae11a@citrix.com>

djs55/xenopsd,cheng--zhang/xenopsd,thomassa/xenopsd,simonjbeaumont/xenopsd,djs55/xenopsd,thomassa/xenopsd,cheng--zhang/xenopsd,koushikcgit/xenopsd,simonjbeaumont/xenopsd,djs55/xenopsd-previous,djs55/xenopsd-previous,djs55/xenopsd,thomassa/xenopsd,koushikcgit/xenopsd,cheng--zhang/xenopsd,djs55/xenopsd-previous,euanh/xenopsd,johnelse/xenopsd,euanh/xenopsd,johnelse/xenopsd,euanh/xenopsd,simonjbeaumont/xenopsd,johnelse/xenopsd,koushikcgit/xenopsd