Cleanup py27 support

Make a few cleanups:
- Remove python 2.7 stanza from setup.py
- Add requires on python >= 3.6 to setup.cfg so that pypi and pip
  know about the requirement
- Remove obsolete sections from setup.cfg:
  * Wheel is not needed for python 3 only repo
  * Some other sections are obsolete
- Update classifiers
- Update requirements, no need for python_version anymore
- Remove unused oslosphinx requirement

Change-Id: I845d02c5fb7cf57beb3628821156bff7310733ca

doc/requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0

lower-constraints.txt

@@ -31,7 +31,6 @@ netaddr==0.7.19
 oslo.config==5.2.0
 oslo.i18n==3.20.0
 oslo.log==3.36.0
-oslosphinx==4.7.0
 pbr==3.1.1
 pep8==1.5.7
 prettytable==0.7.2

setup.cfg

@@ -6,6 +6,7 @@ summary = Freezer - Backup as a Service User Interface
 description-file = README.rst
 home-page = https://github.com/openstack/freezer-web-ui
 license = Apache-2
+python-requires = >=3.6
 classifier =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack
@@ -17,6 +18,8 @@ classifier =
     Operating System :: OS Independent
     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
@@ -30,11 +33,3 @@ keywords =
 [files]
 packages =
     disaster_recovery
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[bdist_wheel]
-universal = 1

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

@@ -7,14 +7,10 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
 oslo.config>=5.2.0 # Apache-2.0
-#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;python_version>='3.4'  # BSD
-oslosphinx>=4.7.0 # Apache-2.0
-astroid==1.6.5;python_version<"3.0" # LGPLv2.1
-astroid==2.1.0;python_version>="3.0" # LGPLv2.1
-pylint==1.9.2;python_version<"3.0" # GPLv2
-pylint==2.3.1;python_version>="3.0" # GPLv2
+sphinx!=1.6.6,!=1.6.7,>=1.6.2  # BSD
+astroid==2.1.0 # LGPLv2.1
+pylint==2.3.1 # GPLv2