Add non-voting job with Python 3 + Django 2.2

Change-Id: I6eb64af5ae1b112195712e07b09e427a541a0089

.zuul.yaml

@@ -17,6 +17,15 @@
     required-projects:
       - name: openstack/horizon
 
+- job:
+    name: horizon-openstack-tox-python3-django22
+    voting: false
+    parent: horizon-openstack-tox-base
+    vars:
+      tox_envlist: py3-dj22
+    required-projects:
+      - name: openstack/horizon
+
 - job:
     name: horizon-selenium-headless
     parent: horizon-openstack-tox-base
@@ -153,6 +162,7 @@
     check:
       jobs:
         - horizon-openstack-tox-python3-django111
+        - horizon-openstack-tox-python3-django22
         - horizon-selenium-headless
         - horizon-integration-tests
         - horizon-dsvm-tempest-plugin

tox.ini

@@ -28,6 +28,13 @@ commands =
   pip install django>=2.1<2.2
   {[unit_tests]commands}
 
+[testenv:py3-dj22]
+basepython = python3
+commands =
+  pip install django>=2.2<2.3
+  {[unit_tests]commands}
+
+
 [testenv:py3-dj111]
 basepython = python3
 commands =
@@ -210,4 +217,4 @@ max-line-length = 80
 # Disable some doc8 checks:
 # D000: Check RST validity
 # - cannot handle "none" for code-block directive
-ignore = D000
+ignore = D000