Support packages for using scitokens on OSG (#35334)

* Support packages for using scitokens on OSG

The Open Science Grid (OSG)  encourages scitokens to provide
certain services (e.g. writing to xrootd). Spack already
supports this through scitokens-cpp and xrootd +scitokens-cpp.

This adds py-htgettoken, a python utility to get a scitoken
from a vault through web authentication. To support htgettoken,
this also adds py-gssapi.

This also adds the OSG CA cert collection which is typically
at /etc/grid-security but pointed to in user installations by
the X509_CERTS_DIR variable.

This allows userspace through spack for functionality that
otherwise depends on installing the RPMs provided by OSG.

* fine, I'll fix style myself then

* fix maintainers

* py-gssapi: version before depends_on

* remove list_url

* add documentation on reason for git describe version numbers

* Apply suggestions from code review

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* better BEARER_TOKEN definition

* import os

* remove older version that don't build with setuptools

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Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

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