VM tests

This package contains general tests for VMs. Tests specific to Crostini and ARC are in their respective packages.

Data files

The vm package includes VM images as external data files suitable for exercising crosvm functionality. For now, only Termina images are included for both x86_64 and arm64.

NOTE: Because the included Termina data files are artifacts from CrOS builders, they use the platform version number as a suffix rather than the date. If updating the data files, please continue to use the version suffix as it's much more meaningful than the date.