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Your problem is that your CirrOS image is not in a qcow2 format.

2020-05-12 09:08:20.621 17117 ERROR cinder.volume.manager ImageCopyFailure: Failed to copy image to volume: qemu-img: Could not open '/var/lib/cinder/conversion/tmpyxMNYgcentos7@lvm': Image is not in qcow2 format

Remove the CirrOS image and create a new one:

wget http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img

openstack image create "cirros" \
--file cirros-0.3.5-x86_64-disk.img \
--disk-format qcow2 --container-format bare \
--public

Try to launch a vm with the new image. It should work now.