fix(xo-server/backupNg.importVmBackup): add missing version for delta

packages/xo-server/src/xapi/index.js.flow

@@ -12,10 +12,13 @@ type MaybeArray<T> = Array<T> | T
 export type DeltaVmExport = {|
   streams: $Dict < () => Promise < AugmentedReadable >>,
     vbds: { [ref: string]: Object },
-  vdis: { [ref: string]: {
+vdis: {
+  [ref: string]: {
     $SR$uuid: string,
       snapshot_of: string,
-  } },
+  }
+},
+version: '1.0.0',
   vifs: { [ref: string]: Object },
 vm: Vm,
 |}

packages/xo-server/src/xo-mixins/backups-ng/index.js

@@ -202,6 +202,7 @@ const importers: $Dict<
       streams,
       vbds: metadata.vbds,
       vdis,
+      version: '1.0.0',
       vifs: metadata.vifs,
       vm: {
         ...vm,