[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

solum-dashboard is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Depends-On: https://review.opendev.org/#/c/693631/

Change-Id: Iaeb821e3e31f7b2bfcd60212790fa3e5d13fd014

.zuul.yaml

@@ -3,6 +3,5 @@
       - check-requirements
       - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs-horizon
       - openstack-python3-ussuri-jobs-horizon
       - openstack-python3-ussuri-jobs

lower-constraints.txt

@@ -100,7 +100,7 @@ semantic-version==2.6.0
 simplejson==3.13.2
 six==1.11.0
 snowballstemmer==1.2.1
-Sphinx==1.6.5
+Sphinx==1.6.2
 sphinxcontrib-httpdomain==1.6.1
 sphinxcontrib-pecanwsme==0.8.0
 sphinxcontrib-websupport==1.0.1

releasenotes/notes/drop-py-2-7-241c1a021379927d.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of solum-dashboard
+    to support python 2.7 is OpenStack Train. The minimum version of Python now
+    supported by solum-dashboard is Python 3.6.

requirements.txt

@@ -3,7 +3,6 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=3.1.1 # Apache-2.0
 # Horizon Core Requirements
-Django<2,>=1.11;python_version<'3.0'  # BSD
 Django<2.1,>=1.11;python_version>='3.0'  # BSD
 django-compressor>=2.2 # MIT
 oslo.log>=3.37.0 # Apache-2.0

setup.cfg

@@ -5,8 +5,6 @@ description-file = README.rst
 license = Apache Software License
 classifier =
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7

test-requirements.txt

@@ -13,7 +13,7 @@ stestr>=2.0.0 # Apache-2.0
 testtools>=2.3.0 # MIT
 unittest2>=1.1.0 # BSD
 
-sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0
 sphinxcontrib-httpdomain>=1.6.1 # BSD

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 1.6
 skipsdist = True
-envlist = py27,py37,py3-{dj111,dj22},pep8
+envlist = py37,py3-{dj111,dj22},pep8
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install {opts} {packages}
 setenv =
@@ -21,7 +22,6 @@ commands =
 	stestr slowest
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source solumdashboard --parallel-mode
@@ -32,11 +32,9 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]
@@ -45,11 +43,9 @@ builtins = _
 exclude=.git,.tox,dist,doc,*lib/python*,*egg,tools,horizon,node_modules
 
 [testenv:docs]
-basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt