CP-4480: Remove check for PV drivers from migrate

If the PV drivers haven't loaded, we shutdown the domain immediately.

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
CP-4666: Make suspend without tools dependent on a server-side flag

Signed-off-by: Vincent Bernardoff <vincent.bernardoff@citrix.com>
Merge pull request #1208 from vbmithr/CP-4666-for-clearwater

CLEARWATER: CP-4666: Make suspend without tools dependent on a server-side flag