Implement Remotefs copy volume from snapshot

In remotefs drive, the code flow of create a clone volume is

1、Create a snapshot of the source volume

2、Call function： copy_volume_from_snapshot
     self._copy_volume_from_snapshot(temp_snapshot,
                                            volume_info,
                                            volume['size'])

3、Delete temporary snapshot

However, the copy_volume_from_snapshot is not implemented in the driver

    def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
        raise NotImplementedError()

This causes the create_volume_from_snapshot create_cloned_volume function to be unable to use.

This bp is aim to achieve this function.