Cleanup py27 support

Make a few cleanups:
- Remove obsolete sections from setup.cfg
- Update classifiers
- Update requirements, no need for python_version anymore
- Use newer openstackdocstheme version
- Remove install_command from tox.ini, the default is fine
- Remove py27 stanza from setup.py

Change-Id: I3f517a43fbc1689ac1627a0a7c802dd08a9e2630

requirements.txt

@@ -2,9 +2,9 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 pbr>=2.0.0
-sphinx>=1.5.1,!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4'  # BSD
+sphinx>=1.5.1,!=1.6.6,!=1.6.7,!=2.1.0  # BSD
 sphinxcontrib-blockdiag
-openstackdocstheme>=1.20.0 # Apache-2.0
+openstackdocstheme>=1.32.1 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 testtools>=0.9.34
 doc8

setup.cfg

@@ -11,17 +11,7 @@ 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 :: Implementation :: CPython
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.7
-
-[build_sphinx]
-all_files = 1
-build-dir = doc/build
-source-dir = doc/source
-builders = html
-warning-is-error = 1
-
-[wheel]
-universal = 1

setup.py

@@ -14,17 +14,8 @@
 # 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'],
     pbr=True)

tox.ini

@@ -8,7 +8,6 @@ ignore_basepython_conflict = True
 basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
-install_command = pip install -U {opts} {packages}
 deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
 commands =