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

Change-Id: I0dbb13d555eb473916ba585c62a0f7433d15afed

lower-constraints.txt

@@ -33,7 +33,6 @@ greenlet==0.4.13
 hacking==0.12.0
 idna==2.6
 imagesize==1.0.0
-ipaddress==1.0.17
 iso8601==0.1.12
 itsdangerous==0.24
 Jinja2==2.10

requirements.txt

@@ -4,7 +4,6 @@
 
 Babel!=2.4.0,>=2.3.4 # BSD
 Flask!=0.11,>=0.10 # BSD
-ipaddress>=1.0.17;python_version<'3.3' # PSF
 jsonschema>=2.6.0 # MIT
 kuryr-lib>=0.5.0 # Apache-2.0
 neutron-lib>=1.13.0 # Apache-2.0

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/kuryr-libnetwork/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,13 +14,12 @@ 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
 
-[bdist_wheel]
-universal = 1
-
 [entry_points]
 oslo.config.opts =
     kuryr_libnetwork = kuryr_libnetwork.opts:list_kuryr_libnetwork_opts
@@ -33,15 +33,6 @@ packages =
 data_files =
     /usr/lib/docker/plugins/kuryr = etc/kuryr.spec
 
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-warning-is-error = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
 [compile_catalog]
 directory = kuryr_libnetwork/locale
 domain = kuryr_libnetwork

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)