Add non-voting tox py38 jobs to Ussuri templates

Python 3.8 is now available on Ubuntu Bionic. This enables
non-voting tox py38 jobs for the Ussuri templates, as it's past
the deadline for enabling voting tests.

Depends-On: https://review.opendev.org/#/c/693743
Change-Id: Idbfefe85dc0ddb04bd2d88fafcf3f6e751a1c3d7

zuul.d/jobs.yaml

@@ -169,6 +169,23 @@
       bindep_profile: test py37
       python_version: 3.7
 
+- job:
+    name: openstack-tox-py38
+    parent: openstack-tox
+    nodeset: ubuntu-bionic
+    timeout: 2400
+    description: |
+
+      Run unit tests for an OpenStack Python project under cPython
+      version 3.8.
+
+      Uses tox with the ``py38`` environment.
+    irrelevant-files: *common-irrelevant-files
+    vars:
+      tox_envlist: py38
+      bindep_profile: test py38
+      python_version: 3.8
+
 - job:
     name: openstack-tox-pypy
     parent: openstack-tox

zuul.d/project-templates.yaml

@@ -439,6 +439,9 @@
         - openstack-tox-pep8
         - openstack-tox-py36
         - openstack-tox-py37
+        - openstack-tox-py38:
+            voting: false
+            branches: master
     gate:
       jobs:
         - openstack-tox-pep8
@@ -466,6 +469,11 @@
         - openstack-tox-py37:
             required-projects:
               - openstack/horizon
+        - openstack-tox-py38:
+            required-projects:
+              - openstack/horizon
+            voting: false
+            branches: master
     gate:
       jobs:
         - openstack-tox-pep8:
@@ -499,6 +507,11 @@
         - openstack-tox-py37:
             required-projects:
               - openstack/neutron
+        - openstack-tox-py38:
+            required-projects:
+              - openstack/neutron
+            voting: false
+            branches: master
     gate:
       jobs:
         - openstack-tox-pep8:
@@ -532,6 +545,11 @@
         - openstack-tox-py37:
             required-projects:
               - openstack/ceilometer
+        - openstack-tox-py38:
+            required-projects:
+              - openstack/ceilometer
+            voting: false
+            branches: master
     gate:
       jobs:
         - openstack-tox-pep8: