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Description of problem:
“virsh snapshot-list“ with option --no-metadata can't show snapshots without metadata

Version-Release number of selected component (if applicable):
Linux test2 4.18.0-31.el8.x86_64 #1 SMP
libvirt-4.5.0-14.module+el8+2210+474b8474.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a guest and take snapshots with option --no-metadata
# virsh snapshot-create-as rhel s1 --no-metadata
Domain snapshot s1 created
2.List the snapshot with option --no-metadata
# virsh snapshot-list rhel --no-metadata
 Name                 Creation Time             State
------------------------------------------------------------


Actual results:
There is no snapshot shown with snapshot-list --no-metadata.
Expected results:
Show the snapshots which is established in step 1.

Additional info:
There are some discussions about this question:
https://www.redhat.com/archives/libvir-list/2018-November/msg00045.html
https://www.redhat.com/archives/libvir-list/2018-November/msg00517.html

This means implementing internal snapshot loading from qcow. Given that qemu's stance is that external snapshots are the way to go I don't expect much attention here, but it's a legitimately missing feature.

The problems which would arise from attempting libvirt to deal with snapshots with no libvirt metadata (e.g. missing snapshot of the XML state) far outweigh the benefits of implementing this, thus I'll close this BZ for now.