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

Change-Id: I73719cd22b52d9e35568d3d0e4e68846ab743522

setup.cfg

@@ -4,7 +4,7 @@ maintainer = monasca
 maintainer_email = monasca@lists.launchpad.net
 description-file = README.rst
 summary = Monasca statsd Python client
-home-page = https://github.com/openstack/monasca-statsd
+home-page = https://opendev.org/openstack/monasca-statsd
 keywords=
     openstack
     monitoring
@@ -12,11 +12,14 @@ keywords=
 license = Apache-2
 include_package_data = True
 test_suite = nose.collector
+python-requires = >=3.6
 classifier =
     Development Status :: 5 - Production/Stable
     License :: OSI Approved :: Apache Software License
     Topic :: System :: Monitoring
     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
@@ -25,16 +28,9 @@ classifier =
 packages =
     monascastatsd
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [pbr]
 autodoc_index_modules = True
 
-[wheel]
-universal = 1
-
 [egg_info]
 tag_build =
 tag_date = 0

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)