Add tox env and job for Django 2.2

Depends-On: https://review.opendev.org/#/c/681969/

Change-Id: I95407fe6f9b21ee589f80371663ed35ea2924cf4

.zuul.yaml

@@ -1,14 +1,9 @@
 - project:
     templates:
       - check-requirements
+      - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs-horizon
       - openstack-python-jobs-horizon
       - openstack-python3-train-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
-    check:
-      jobs:
-        - horizon-openstack-tox-python3-django111
-    gate:
-      jobs:
-        - horizon-openstack-tox-python3-django111

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py37,pep8
+envlist = py27,py37,py3-{dj111,dj22},pep8
 minversion = 2.3.2
 skipsdist = True
 
@@ -15,10 +15,10 @@ deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
-commands = {[unit_tests]commands}
-
-[unit_tests]
-commands = python manage.py test {posargs} --settings=neutron_vpnaas_dashboard.test.settings
+commands =
+  dj111: pip install django>=1.11,<2
+  dj22: pip install django>=2.2,<2.3
+  python manage.py test {posargs} --settings=neutron_vpnaas_dashboard.test.settings
 
 [testenv:pep8]
 basepython = python3
@@ -38,13 +38,6 @@ commands =
   coverage xml --omit '.tox/cover/*' -o 'cover/coverage.xml'
   coverage html --omit '.tox/cover/*' -d 'cover/htmlcov'
 
-[testenv:py3-dj111]
-basepython = python3
-commands =
-  pip install django>=1.11,<2
-  {[unit_tests]commands}
-  pip freeze
-
 [testenv:docs]
 basepython = python3
 deps =