Fix stable gate

Note that this includes switching the DSVM job to run tests under py3.

Related-Change: If33532232572e802b2099f39f4231ee6add6d5a9
Related-Change: I459d6065a3e4290768c499e7973917f7cf4ce2e7
Related-Change: I61750a1083a1c97a6222ec9040f90980ee73acc8
Change-Id: I7558ca9281ff32493a81c3ef85873a5f75b4d599

.zuul.yaml

@@ -191,7 +191,7 @@
     vars:
       tox_constraints_file: '{{ ansible_user_dir }}/src/opendev.org/openstack/requirements/upper-constraints.txt'
       # This tox env get run twice; once for Keystone and once for tempauth
-      tox_envlist: func
+      tox_envlist: func-py3
       devstack_localrc:
         SWIFT_HASH: changeme
         # We don't need multiple replicas to run purely functional tests.

lower-constraints.txt

@@ -1,5 +1,6 @@
 alabaster==0.7.10
 asn1crypto==0.24.0
+attrs==21.4.0
 Babel==2.5.3
 bandit==1.1.0
 boto==2.32.1

py2-constraints.txt

@@ -74,3 +74,5 @@ gitdb2===2.0.6
 # Projects that are known to have had a final py2-supporting release
 bandit===1.6.2
 PasteDeploy==2.1.1
+attrs==22.1.0
+smmap==3.0.5

tox.ini

@@ -93,6 +93,7 @@ basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/victoria}
   -r{toxinidir}/doc/requirements.txt
+  -r{toxinidir}/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:api-ref]