fix MoveStorage fail: The cache in the storage already exists, and th…

[llifezou]

func (m *Manager) ReplicaUpdate(ctx context.Context, sector storage.SectorRef, pieces []abi.PieceInfo) (out storage.ReplicaUpdateOut, err error) {
	// ....
	err = m.sched.Schedule(ctx, sector, sealtasks.TTReplicaUpdate, selector, m.schedFetch(sector, storiface.FTUnsealed|storiface.FTSealed|storiface.FTCache, storiface.PathSealing, storiface.AcquireCopy), func(ctx context.Context, w Worker) error {
		err := m.startWork(ctx, w, wk)(w.ReplicaUpdate(ctx, sector, pieces))
		if err != nil {
			return xerrors.Errorf("startWork: %w", err)
		}

		waitRes()
		return nil
	})
       // ....
}

m.schedFetch(sector, storiface.FTUnsealed|storiface.FTSealed|storiface.FTCache, storiface.PathSealing, storiface.AcquireCopy)
schedFetch use storiface.AcquireCopy, The cache files in the storage will continue to exist. When FinalizeReplicaUpdate, the mv will fail because the cache files already exist.