Add non-voting Python 3.10 jobs to Zed template

Use Fedora 35 nodeset until ubuntu-focal gets python3.10 package or
until we have ubuntu 22.04

Tests on arm64 arch are not supported at the moment.

Change-Id: I685563200ec342363848b713854c34a86dfb5fd0

zuul.d/jobs.yaml

@@ -285,6 +285,23 @@
 
       Uses tox with the ``py39`` environment in arm64 platform.
 
+- job:
+    name: openstack-tox-py310
+    parent: openstack-tox
+    nodeset: fedora-latest
+    timeout: 2400
+    description: |
+
+      Run unit tests for an OpenStack Python project under cPython
+      version 3.10.
+
+      Uses tox with the ``py310`` environment.
+    irrelevant-files: *common-irrelevant-files
+    vars:
+      tox_envlist: py310
+      bindep_profile: test py310
+      python_version: '3.10'
+
 - job:
     name: openstack-tox-pypy
     parent: openstack-tox

zuul.d/project-templates.yaml

@@ -548,6 +548,8 @@
         - openstack-tox-pep8
         - openstack-tox-py38
         - openstack-tox-py39
+        - openstack-tox-py310:
+            voting: false
     gate:
       jobs:
         - openstack-tox-pep8
@@ -575,6 +577,10 @@
         - openstack-tox-py39:
             required-projects:
               - openstack/horizon
+        - openstack-tox-py310:
+            required-projects:
+              - openstack/horizon
+            voting: false
     gate:
       jobs:
         - openstack-tox-pep8:
@@ -608,6 +614,10 @@
         - openstack-tox-py39:
             required-projects:
               - openstack/neutron
+        - openstack-tox-py310:
+            required-projects:
+              - openstack/neutron
+            voting: false
     gate:
       jobs:
         - openstack-tox-pep8:
@@ -641,6 +651,10 @@
         - openstack-tox-py39:
             required-projects:
               - openstack/ceilometer
+        - openstack-tox-py310:
+            required-projects:
+              - openstack/ceilometer
+            voting: false
     gate:
       jobs:
         - openstack-tox-pep8: