In pretty much all of our Python packages, we generate a package version

using legacy identifiers of "alpha" and "beta". These get turned into

"a" and "b" by pkg_resources, and a warning is thrown to inform us

that we're doing it wrong.
To reduce those warnings, this change converts the legacy naming to

modern naming when generating the package version.

Built packages. Saw the correct identifier in the package file, without

seeing any warnings.