Pass correct source_id to _handle_bootable_volume_glance_meta()

Pass correct source_id to _handle_bootable_volume_glance_meta()

When we create a new volume from existing volume which has
volume_image_metadata, volume_image_metadata was not copied
to cloned volume.

This is a regression from Liberty and the root cause of this
problem was introduced via commit
032032f0c329b4eddcbf2185399396ff4fd5f00d.

This patch fixed a problem to pass correct source_id to
_handle_bootable_volume_glance_meta().

Change-Id: Ife1e9a6a25704569f8a599d19eee893bc7c0a469
Closes-Bug: #1557783