Drop Django 1.11 support

Django 1.11 ends its extended support in April 2020 (which is before
Ussuri release), so horizon drops Django 1.11 support in Ussuri.

tox envs for non-primary Django versions are no longer needed in tox.ini
as testing environments for non-primary Django versions are setup in
the zuul jobs now.

horizon>=17.1.0 is required to use Django 2.2. requirements.txt and
lower-constraints.txt are updated accordingly. for more info. please
refer [1].
Depends-On: https://review.opendev.org/#/c/700733/
[1] https://etherpad.openstack.org/p/Enable_Django22_support_in_Horizon_Plugin

Change-Id: I59e016fd771282798bd095c562e2fa11a8e4ea43

lower-constraints.txt

@@ -16,10 +16,10 @@ cryptography==2.1.4
 debtcollector==1.19.0
 decorator==4.2.1
 deprecation==2.0
-Django==1.11
+Django==2.2
 django-appconf==1.0.2
 django-compressor==2.0
-django-formtools==2.0
+django-formtools==2.2
 django-pyscss==2.0.2
 docutils==0.14
 dogpile.cache==0.6.5
@@ -31,7 +31,7 @@ fixtures==3.0.0
 flake8==2.5.5
 futurist==1.6.0
 hacking==0.12.0
-horizon==15.0.0.0b1
+horizon==17.1.0
 idna==2.6
 imagesize==1.0.0
 iso8601==0.1.11
@@ -82,10 +82,10 @@ pyparsing==2.2.0
 pyperclip==1.6.0
 pyScss==1.3.4
 python-barbicanclient==4.6.0
-python-cinderclient==3.5.0
+python-cinderclient==5.0.0
 python-dateutil==2.7.0
 python-glanceclient==2.9.1
-python-keystoneclient==3.17.0
+python-keystoneclient==3.22.0
 python-mimeparse==1.6.0
 python-muranoclient==0.8.2
 python-neutronclient==6.7.0

requirements.txt

@@ -4,7 +4,7 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
 beautifulsoup4>=4.6.0 # MIT
-django-formtools>=2.0 # BSD
+django-formtools>=2.2 # BSD
 iso8601>=0.1.11 # MIT
 six>=1.10.0 # MIT
 python-muranoclient>=0.8.2 # Apache-2.0
@@ -16,4 +16,4 @@ castellan>=0.18.0 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
 semantic-version>=2.3.1 # BSD
 
-horizon>=15.0.0.0b1 # Apache-2.0
+horizon>=17.1.0 # Apache-2.0

tox.ini

@@ -1,7 +1,8 @@
 [tox]
-envlist = py37,py3-{dj111,dj22},pep8
+envlist = py37,pep8
 minversion = 2.0
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
 basepython = python3
@@ -14,8 +15,6 @@ deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/
        -r{toxinidir}/test-requirements.txt
        http://tarballs.openstack.org/heat-dashboard/heat-dashboard-master.tar.gz
 commands =
-  dj111: pip install django>=1.11,<2
-  dj22: pip install django>=2.2,<2.3
   {toxinidir}/manage.py test muranodashboard --settings=muranodashboard.tests.settings
 
 [testenv:pep8]