We just check these for syntax rather than exact value because the
underlying archive library is free to evolve its exact encoding over time
as long as the result is semantically equivalent, and we don't want these
tests to break when we build on different versions of Go.
* Converting archive_file to datasource.
* Ratcheting back new dir perms.
* Ratcheting back new dir perms.
* goimports
* Adding output_base64sha256 attribute to archive_file.
Updating docs.
* Dropping CheckDestroy since this is a data source.
* Correcting data source attribute checks.