vzmigrate: break a long line

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
vzmigrate: support for copying CT dump file

In case container is in suspended state, it makes sense to copy
its dump file as well, so it can be unsuspended on the destination.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>