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

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

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

Also changing tox path to py3 to fix gate.
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/

Co-Authored-By: Vishal Manchanda <manchandavishal143@gmail.com>
Change-Id: Id734dd4772ee4476ae1cfa8fb3c3e4b81109a113

.zuul.yaml

@@ -5,7 +5,6 @@
       - horizon-nodejs10-jobs
       - openstack-cover-jobs-horizon
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs-horizon
       - openstack-python3-ussuri-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

karma.conf.js

@@ -20,7 +20,7 @@ var path = require('path');
 
 module.exports = function (config) {
   // This tox venv is setup in the post-install npm step
-  var toxPath = '.tox/py27/lib/python2.7/site-packages/';
+  var toxPath = '.tox/py36/lib/python3.6/site-packages/';
   var xstaticPath = toxPath + 'xstatic/pkg/';
 
   config.set({

manage.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2014 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may

package.json

@@ -16,7 +16,7 @@
     "karma-ng-html2js-preprocessor": "1.0.0"
   },
   "scripts": {
-    "postinstall": "if [ ! -d .venv ]; then tox -epy27 --notest; fi",
+    "postinstall": "if [ ! -d .venv ]; then tox -epy36 --notest; fi",
     "lint": "eslint --no-color designatedashboard/static",
     "lintq": "eslint --quiet designatedashboard/static",
     "test": "karma start karma.conf.js --single-run"

releasenotes/notes/drop-py-2-7-ae8cade4a0ee1da8.yaml

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

setup.cfg

@@ -13,8 +13,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     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

@@ -10,7 +10,6 @@ pylint==1.4.5 # GPLv2
 testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 unittest2>=1.1.0 # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 1.6
-envlist = py27,py37,py3-{dj111,dj22},pep8
+envlist = py37,py3-{dj111,dj22},pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          NOSE_WITH_OPENSTACK=1
@@ -26,15 +27,12 @@ commands =
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands =
   coverage erase
   coverage run {toxinidir}/manage.py test designatedashboard --settings=designatedashboard.tests.settings {posargs}
@@ -42,12 +40,10 @@ commands =
   coverage html --include 'designatedashboard/*' -d cover
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html -d doc/build/doctrees doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 envdir = {toxworkdir}/docs
 whitelist_externals =
@@ -67,11 +63,9 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,releasenotes,node_modules
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt