This change fixes a few CI failures in the zuul-operator
* nox docs: the regex expression wasn't accepted
* version.py was broken because pkg_resources is removed from newer
pythons
* the /api/tenants endpoint no longer appears to return projects or
queue items so the functional test was failing
Change-Id: Ia492fa48ff682454553d9c1b04d4e83b40a276cf
c1febff1ea