vz: set PVMT_DONT_CREATE_DISK migration flag
vz: set PVMT_DONT_CREATE_DISK migration flag

This flag tells backend not to create instance
disks making behavior the same as in qemu driver.
Disk files have to be created beforehand on target
host manually or by upper management layer i.e.
OpenStack Nova.

Signed-off-by: Pavel Glushchak <a01950bf8d7d49f8f7ea5c1c62fa9db3304a0d63@virtuozzo.com>

jfehlig/libvirt,taget/libvirt,jardasgit/libvirt,datto/libvirt,datto/libvirt,crobinso/libvirt,VenkatDatta/libvirt,datto/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,zippy2/libvirt,taget/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,VenkatDatta/libvirt,taget/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,jfehlig/libvirt,zippy2/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,eskultety/libvirt,olafhering/libvirt,olafhering/libvirt,eskultety/libvirt,datto/libvirt,nertpinx/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,taget/libvirt,andreabolognani/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jfehlig/libvirt,eskultety/libvirt,olafhering/libvirt,crobinso/libvirt,taget/libvirt,datto/libvirt,libvirt/libvirt,fabianfreyer/libvirt,olafhering/libvirt