Use Horizon project template for django jobs

Horizon defined a project template 'horizon-non-primary-django-jobs'
for django jobs. This patch use that template to run django jobs
here. For information please refer [1]

[1] https://review.opendev.org/#/c/681969/

Change-Id: I8df240f0f297c0387bef304e285ce8dd9f34c85d

.zuul.yaml

@@ -1,6 +1,7 @@
 - project:
     templates:
       - check-requirements
+      - horizon-non-primary-django-jobs
       - openstack-cover-jobs-horizon
       - openstack-lower-constraints-jobs-horizon
       - openstack-python-jobs-horizon
@@ -13,15 +14,6 @@
             voting: false
         - manila-ui-integration-tests:
             voting: false
-        - horizon-openstack-tox-python3-django111
-        - horizon-openstack-tox-py27dj19
-        - horizon-openstack-tox-py27dj110
-    gate:
-      jobs:
-        - horizon-openstack-tox-python3-django111
-        - horizon-openstack-tox-py27dj19
-        - horizon-openstack-tox-py27dj110
-
 - job:
     name: manila-ui-dsvm
     parent: legacy-dsvm-base

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py27,py37,pep8,py27dj19,py27dj110,py3-dj111
+envlist = py27,py37,pep8,py3-{dj111,dj22}
 skipsdist = True
 
 [testenv]
@@ -11,7 +11,10 @@ setenv =
 deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = /bin/bash run_tests.sh -N --no-pep8 {posargs}
+commands =
+  dj111: pip install django>=1.11,<2
+  dj22: pip install django>=2.2,<2.3
+  /bin/bash run_tests.sh -N --no-pep8 {posargs}
 
 [testenv:py27]
 setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings
@@ -48,28 +51,6 @@ commands = flake8
 basepython = python3
 commands = {posargs}
 
-# Django-1.8 is LTS
-[testenv:py27dj18]
-basepython = python2.7
-commands = pip install django>=1.8,<1.9
-           /bin/bash run_tests.sh -N --no-pep8 {posargs}
-
-[testenv:py27dj19]
-basepython = python2.7
-commands = pip install django>=1.9,<1.10
-           /bin/bash run_tests.sh -N --no-pep8 {posargs}
-
-[testenv:py27dj110]
-basepython = python2.7
-commands = pip install django>=1.10,<1.11
-           /bin/bash run_tests.sh -N --no-pep8 {posargs}
-
-[testenv:py3-dj111]
-basepython = python3
-commands =
-  pip install django>=1.11,<2
-  {[testenv]commands}
-
 [testenv:cover]
 basepython = python3
 commands = {toxinidir}/tools/cover.sh {posargs}