Cleanup py27 support

This repo is now testing only with Python 3, so let's make
a few cleanups:
- Remove python 2.7 stanza from setup.py
- Remove obsolete sections from setup.cfg
- Update classifiers
- Use newer openstackdocstheme and Sphinx versions
- Remove install_command from tox.ini, the default is fine;
  move constraints into deps
- Remove Babel from requirements, it's not needed for running;
  remove babel.cfg likewise
- Use TOX_CONSTRAINTS_FILE, UPPER_CONSTRAINTS_FILE is obsolete
- update hacking to version 3.0

Change-Id: Ibcb7be4fd057b24147b7b562302ea362ad8c71b3

babel.cfg

@@ -1 +0,0 @@
-[python: **.py]

requirements.txt

@@ -3,7 +3,6 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-Babel!=2.4.0,>=2.3.4 # BSD
 openstacksdk>=0.24.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0

setup.cfg

@@ -13,41 +13,16 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [files]
 packages =
     senlin_tempest_plugin
 
-[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 = senlin_tempest_plugin/locale
-domain = senlin_tempest_plugin
-
-[update_catalog]
-domain = senlin_tempest_plugin
-output_dir = senlin_tempest_plugin/locale
-input_file = senlin_tempest_plugin/locale/senlin_tempest_plugin.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = senlin_tempest_plugin/locale/senlin_tempest_plugin.pot
-
 [entry_points]
 tempest.test_plugins =
     senlin-tempest-plugin = senlin_tempest_plugin.plugin:SenlinTempestPlugin

setup.py

@@ -13,17 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

test-requirements.txt

@@ -4,14 +4,14 @@
 
 # Hacking already pins down pep8, pyflakes and flake8
 coverage!=4.4,>=4.0 # Apache-2.0
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0.0,<3.1.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 
 # Documentation
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=2.1.0,>=2.0.0 # BSD
 reno>=2.5.0 # Apache-2.0
 
 # Bandit build requirements

tox.ini

@@ -6,9 +6,10 @@ ignore_basepython_conflict = True
 
 [testenv]
 basepython = python3
-deps = -r{toxinidir}/test-requirements.txt
+deps =
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -r{toxinidir}/test-requirements.txt
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 commands =
     find . -type f -name "*.py[c|o]" -delete
     ostestr --slowest --regex 'senlin_tempest_plugin.tests.api.*' {posargs}
@@ -50,7 +51,9 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 # Temporarily disable complaints about docstring for public module/class/method
 # H106 Don't put vim configuration in source files
 # H203 Use assertIs(Not)None to check for None
-ignore = D100,D101,D102,D103,D104,D105,D200,D201,D202,D204,D205,D300,D301,D400,D401,I100,I201
+# W503 line break before binary operator
+# W504 line break after binary operator
+ignore = D100,D101,D102,D103,D104,D105,D200,D201,D202,D204,D205,D300,D301,D400,D401,I100,I201,W503,W504
 enable-extensions=H106,H203
 show-source = true
 exclude=.venv,.git,.tox,*lib/python*,*egg,tools,build,releasenotes