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: I186bb5edfaece73222534fbede928f0903595b04

.zuul.yaml

@@ -1,12 +1,7 @@
 - project:
     templates:
       - check-requirements
+      - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs-horizon
       - openstack-python3-ussuri-jobs-horizon
       - publish-openstack-docs-pti
-    check:
-      jobs:
-        - horizon-openstack-tox-python3-django111
-    gate:
-      jobs:
-        - horizon-openstack-tox-python3-django111

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py37,pep8,docs
+envlist = py37,py3-{dj111,dj22},pep8,docs
 minversion = 3.1.1
 skipsdist = True
 ignore_basepython_conflict = True
@@ -16,6 +16,8 @@ deps =
   https://tarballs.openstack.org/horizon/horizon-master.tar.gz
   https://tarballs.openstack.org/python-tackerclient/python-tackerclient-master.tar.gz
 commands =
+  dj111: pip install django>=1.11,<2
+  dj22: pip install django>=2.2,<2.3
   {envpython} {toxinidir}/manage.py test tacker_horizon --settings=tacker_horizon.test.settings {posargs}
 
 [testenv:py36]
@@ -70,8 +72,3 @@ deps =
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 
-[testenv:py3-dj111]
-basepython = python3
-commands =
-  pip install django>=1.11,<2
-  {[testenv]commands}