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: NPavel Glushchak <pglushchak@virtuozzo.com>

src/vz/vz_sdk.c

@@ -4740,7 +4740,7 @@ int prlsdkSwitchToSnapshot(virDomainObjPtr dom, const char *uuid, bool paused)
  * connection to dispatcher
  */
 
-#define PRLSDK_MIGRATION_FLAGS (PSL_HIGH_SECURITY)
+#define PRLSDK_MIGRATION_FLAGS (PSL_HIGH_SECURITY | PVMT_DONT_CREATE_DISK)
 
 int prlsdkMigrate(virDomainObjPtr dom, virURIPtr uri,
                   const unsigned char *session_uuid,