v2.0

• Replace use of m2crypto and pyOpenSSL with urllib3
• Replace use of pykerberos with gssapi
• Use standard Requires for Python modules instead of PyInstaller
• Add --vaultcertname option to specify an alternative certificate name. That used to be an additional optional meaning of the --vaultalias option, but urllib3 requires only one name to match.
• Add setuptools build infrastructure
• Refactor htgettoken script into module with entry point. This enables invoking htgettoken as htgettoken.main() from Python.
• Use wheels to build/install Python package, which simplified the entry points and improves (slightly) the metadata
• Fix the httokensh background process's check for its parent process. That is only a backup in case only the parent process is hard-killed, because normally the parent process kills the background process when the parent exits.
• Use newer sts secrets API for token exchanges.
• Fix the -o/--outfile option to work with relative paths.
• Change the --nobearertoken option to always get and save a vault token.