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

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

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

Change-Id: Ie1e6a0b1aac4aca3f7f6a3ef7113ceee28233463

.zuul.yaml

@@ -1,5 +1,4 @@
 - project:
     templates:
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti

releasenotes/notes/drop-python-2-7-73d3113c69d724d6.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. The minimum version of Python now
+    supported by whereto is Python 3.6.

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/whereto/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,8 +14,6 @@ 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
@@ -27,15 +26,6 @@ packages =
 console_scripts =
     whereto = whereto.app:main
 
-[build_sphinx]
-all-files = 1
-warning-is-error = 1
-source-dir = doc/source
-build-dir = doc/build
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
 [compile_catalog]
 directory = whereto/locale
 domain = whereto
@@ -49,6 +39,3 @@ input_file = whereto/locale/whereto.pot
 keywords = _ gettext ngettext l_ lazy_gettext
 mapping_file = babel.cfg
 output_file = whereto/locale/whereto.pot
-
-[wheel]
-universal = 1

test-requirements.txt

@@ -5,8 +5,7 @@
 hacking>=0.12.0,<0.13 # Apache-2.0
 
 coverage>=4.0,!=4.4 # Apache-2.0
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
 oslotest>=1.10.0 # Apache-2.0
 testrepository>=0.0.18  # Apache-2.0/BSD
 testtools>=1.4.0 # MIT

tox.ini

@@ -1,11 +1,12 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.1
-envlist = py27,py37,pep8
+envlist = py37,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
-install_command = pip install {opts} {packages}
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHONWARNINGS=default::DeprecationWarning
@@ -18,37 +19,30 @@ commands =
   coverage report --show-missing
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
 # The sphinxcontrib.autoprogram extension requires python 3's version
 # of argparse, so force python 3 here to ensure the check job that
 # builds the docs on OpenStack infrastructure uses python 3.
-basepython = python3
 commands = {posargs}
 
 [testenv:bindep]
-basepython = python3
 deps = bindep
 commands = bindep test
 
 [testenv:cover]
-basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
-basepython = python3
 commands =
    sphinx-build --keep-going -b html -W doc/source doc/build/html
 
 [testenv:releasenotes]
-basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]