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: Ib5ea9d22170b9d0285a74c6e4924fd4b6e9f4eb8

lower-constraints.txt

@@ -13,7 +13,7 @@ cryptography==2.1.4
 debtcollector==1.19.0
 decorator==4.2.1
 deprecation==2.0
-Django==1.11.11
+Django==2.2
 django-appconf==1.0.2
 django-babel==0.6.2
 django-compressor==2.2
@@ -27,7 +27,7 @@ fixtures==3.0.0
 flake8==2.5.5
 futurist==1.6.0
 hacking==0.12.0
-horizon==14.0.0.b3
+horizon==17.1.0
 httplib2==0.10.3
 idna==2.6
 imagesize==1.0.0
@@ -58,7 +58,7 @@ oslo.i18n==3.20.0
 oslo.policy==1.34.0
 oslo.serialization==2.25.0
 oslo.utils==3.36.0
-osprofiler==2.0.0
+osprofiler==2.3.0
 packaging==17.1
 pbr==2.0.0
 pep8==1.5.7
@@ -72,9 +72,9 @@ pyOpenSSL==17.5.0
 pyparsing==2.2.0
 pyperclip==1.6.0
 pyScss==1.3.4
-python-cinderclient==3.5.0
+python-cinderclient==5.0.0
 python-glanceclient==2.9.1
-python-keystoneclient==3.15.0
+python-keystoneclient==3.22.0
 python-mimeparse==1.6.0
 python-neutronclient==6.7.0
 python-novaclient==10.1.0

requirements.txt

@@ -4,7 +4,7 @@
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
-horizon>=14.0.0.0b3 # Apache-2.0
+horizon>=17.1.0 # Apache-2.0
 
 PyYAML>=3.12 # MIT
 python-watcherclient>=1.1.0 # Apache-2.0

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py37,py36,py3-{dj111,dj22},pep8
+envlist = py37,py36,pep8
 skipsdist = True
 
 [testenv]
@@ -18,8 +18,6 @@ deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
-    dj111: pip install django>=1.11,<2
-    dj22: pip install django>=2.2,<2.3
     rm -f .testrepository/times.dbm
     find . -type f -name "*.pyc" -delete
     find . -type d -name "__pycache__" -delete