Deleting volumes which are consumed as a basis for others

This patch includes two test scenarios:

- Create a cloned volume from another volume. Cinder should
be able to delete the source volume.

- Create a volume from a snapshot. Cinder should be able to
delete the source volumes while the new volume still exists.

Related-Bug: #1969643
Depends-On: https://review.opendev.org/c/openstack/cinder/+/848013
Change-Id: I8daed0824f5ac60877e839265c09217dcce6dd21
1 file changed