Makes those files conformant with current linting rules and avoids
linting errors when we need to toch them again.
Previous doing "pre-commit run -a" uncovered these errors, now is no
longer reporting any other errors.
Change-Id: Ie4cf229c8f11c2b55b323eac23c89483b26d3781
Adds basic snapshotting of a libvirt environment, using
external snapshots with backing files. Limitations of
this approach can be seen in the README.
Change-Id: I7e17ae96202cf8975c0414b884c50e81a218bf7f