CA-100511: Don't fail SXM when guests are shutdown during migration

If, during the VDI copy to the remote, the guest is shutdown then, when it
comes to moving the domain, Xenops will complain that the domain doesn't exist.
We had already desinged to handle this case but the exception catch needed to
be broadened to match the new "extra" TypedTable used for the VM metadata.

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #1252 from simonjbeaumont/CA-100511

CA-100511: Don't fail SXM when guests are shutdown during migration