test: issue2551366. Probe for open port in test_liveserver.py Add a method to probe for an open port to wsgi_liveserver.py. Start the roundup server under wsgi on the open port. If a port can't be found, it skips all tests. Also changed all hardcoded URL references to use the dynamicly determined tracker url/port value. I fed my patch to wsgi_liveserver.py upstream at: https://github.com/jerrykan/wsgi-liveserver/issues/3

# setuptools required for installation - missing from newer base images
setuptools
# human timezones
pytz
# indexer
Whoosh
# xapian is also installed
# extra database support
psycopg2
mysqlclient
redis
# encryption
gpg
# java web tokens
PyJWT
# extra HTTP compression methods
Brotli
zstd
# jinja2 template engine
Jinja2