VM config can now specify the requirement on the virtual platform
version. At runtime, the requirement is matched against the actual
virtual platform version that crosvm implements. If they don't match,
the VM can't be created. The version format follows SemVer, allowing us
to express backwards compatible and incompatible changes in the future.
Bug: 193504487
Test: atest VirtualizationTestCases
Change-Id: I23d370081e10399502178b9cfe8a46b05addf186
Root digests of APEX payload are now collected by microdroid_manager and
stored in instance.img and passed to apexd.
Bug: 199371341
Test: MicrodroidHostTestCases
Change-Id: I940347068400822f7d8140c3daf68036f553b087