Add better usage message, clean up, fix argument-handling bug.
Add check for at least one Ethernet device.
Tweak debug output.
Begin to make validators modular.
Use single ImageAccess handle across all validations.
Clean up debugging.
Rename files & packages.
Add setup.py & .gitignore.
Reorganized modules.
Reworked module path search and execution for installed version.
Add methods for accessing class variables.
Improve output formatting, use ImageAccess class methods.
Implement unmounted Ubuntu validator, stub Red Hat validators.
Implement checking mounted Red Hat images.
Explicitly call ImageAccess.__del__() to ensure correct FUSE unmount.
Make ImageAccess.__del__() idempotent.