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 and fix the failed test cases for django2.2 support by replacing
None with an empty string and add renderer argument.
For information please refer [1], [2], [3].

[1] https://review.opendev.org/#/c/681969/
[2] https://github.com/django/django/commit/6fe9c45b725
[3] https://docs.djangoproject.com/en/2.1/releases/2.1/#features-removed-in-2-1
Change-Id: I9a62bb0a56b16cd6caa6cc9bf7db9b85c99ed580

.zuul.yaml

@@ -1,13 +1,11 @@
 - project:
     templates:
       - check-requirements
+      - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs
       - openstack-python-jobs-horizon
       - openstack-python3-train-jobs-horizon
       - release-notes-jobs-python3
-    check:
-      jobs:
-        - sahara-dashboard-tox-python3-django111
     experimental:
       jobs:
         - sahara-dashboard-integration
@@ -23,12 +21,6 @@
       - ^releasenotes/.*$
       - ^sahara_dashboard/locale/.*$
 
-- job:
-    name: sahara-dashboard-tox-python3-django111
-    parent: sahara-dashboard-tox-base
-    vars:
-      tox_envlist: py3-dj111
-
 - job:
     name: sahara-dashboard-integration
     parent: devstack

sahara_dashboard/content/data_processing/clusters/nodegroup_templates/tests.py

@@ -177,14 +177,14 @@ class DataProcessingNodeGroupTests(test.TestCase):
              'hadoop_version': ngt.hadoop_version,
              'description': ngt.description,
              'flavor': flavor.id,
-             'availability_zone': None,
+             'availability_zone': '',
              'storage': 'ephemeral_drive',
              'volumes_per_node': 0,
              'volumes_size': 0,
-             'volume_type': None,
+             'volume_type': '',
              'volume_local_to_instance': False,
-             'volumes_availability_zone': None,
-             'floating_ip_pool': None,
+             'volumes_availability_zone': '',
+             'floating_ip_pool': '',
              'security_autogroup': True,
              'processes': 'HDFS:namenode',
              'use_autoconfig': True,
@@ -279,14 +279,14 @@ class DataProcessingNodeGroupTests(test.TestCase):
              'hadoop_version': ngt.hadoop_version,
              'description': ngt.description,
              'flavor': flavor.id,
-             'availability_zone': None,
+             'availability_zone': '',
              'storage': 'ephemeral_drive',
              'volumes_per_node': 0,
              'volumes_size': 0,
-             'volume_type': None,
+             'volume_type': '',
              'volume_local_to_instance': False,
-             'volumes_availability_zone': None,
-             'floating_ip_pool': None,
+             'volumes_availability_zone': '',
+             'floating_ip_pool': '',
              'is_proxy_gateway': False,
              'security_autogroup': True,
              'processes': 'HDFS:namenode',
@@ -328,10 +328,10 @@ class DataProcessingNodeGroupTests(test.TestCase):
             volumes_availability_zone=None,
             node_processes=['namenode'],
             node_configs={},
-            floating_ip_pool=None,
+            floating_ip_pool='',
             security_groups=[],
             auto_security_group=True,
-            availability_zone=None,
+            availability_zone='',
             use_autoconfig=True,
             is_proxy_gateway=False,
             shares=[],

sahara_dashboard/content/data_processing/clusters/nodegroup_templates/workflows/create.py

@@ -382,7 +382,7 @@ class CheckboxSelectMultiple(forms.CheckboxSelectMultiple):
             attrs.update(extra_attrs)
         return attrs
 
-    def render(self, name, value, attrs=None, choices=()):
+    def render(self, name, value, attrs=None, choices=(), renderer=None):
         if value is None:
             value = []
         has_id = attrs and 'id' in attrs

sahara_dashboard/test/test_data/sahara_data.py

@@ -133,7 +133,7 @@ def data(TEST):
     # Nodegroup_Templates.
     ngt1_dict = {
         "created_at": "2014-06-04T14:01:03",
-        "description": None,
+        "description": "",
         "flavor_id": "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
         "availability_zone": None,
         "floating_ip_pool": None,

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py3-dj111,py3-dj21,py27,py37,pep8
+envlist = py3-{dj111,dj22},py27,py37,pep8
 skipsdist = True
 
 [testenv]
@@ -10,7 +10,10 @@ deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals = /bin/bash
-commands = {envpython} {toxinidir}/manage.py test --settings=sahara_dashboard.test.settings --exclude-tag integration {posargs}
+commands =
+  dj111: pip install django>=1.11,<2
+  dj22: pip install django>=2.2,<2.3
+  {envpython} {toxinidir}/manage.py test --settings=sahara_dashboard.test.settings --exclude-tag integration {posargs}
 
 [testenv:py27]
 setenv =
@@ -32,22 +35,6 @@ commands = flake8
 basepython = python3
 commands = {posargs}
 
-[testenv:py3-dj111]
-basepython = python3
-setenv =
-   DJANGO_SETTINGS_MODULE=sahara_dashboard.test.settings
-commands =
-  pip install django>=1.11,<2
-  {[testenv]commands}
-
-[testenv:py3-dj21]
-basepython = python3
-setenv =
-   DJANGO_SETTINGS_MODULE=sahara_dashboard.test.settings
-commands =
-  pip install django>=2.1,<2.2
-  {[testenv]commands}
-
 [testenv:py27integration]
 basepython = python2.7
 passenv = AVCONV_INSTALLED