Failure to load deprecated libraries leads to misleading error message for users

[h4xnoodle]

This try : except leads to a misleading error message if the nested dependency of, say load_pkcs12, no longer exists

It seems like the HAVE_OPENSSL value

gsutil/gslib/commands/signurl.py

Line 65 in a872f98

HAVE_OPENSSL = False

leads to the user error message of CommandException: The signurl command requires the pyopenssl library (try pip install pyopenssl or easy_install pyopenssl) which leads to confusion about how to proceed.

Workaround: install the current n-1 version of pyopenssl: pip3 install pyopenssl==23.2.0 which does indeed work

Test case: gsutil signurl -d 10m <some file...>

Related: #1753