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
- Update classifiers
- Update requirements, no need for python_version anymore

Change-Id: I266b56f998f092d14d6ccbec1365dc42568ffdd5

doc/requirements.txt

@@ -1,6 +1,6 @@
 # The order of packages is significant, because pip processes them in the order
 # 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,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2  # BSD
 openstackdocstheme>=1.24.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0

lower-constraints.txt

@@ -52,5 +52,4 @@ traceback2==1.4.0
 unittest2==1.1.0
 wrapt==1.7.0
 pydot==1.4.1
-networkx==2.3;python_version>='3.4'
-networkx==2.0;python_version<'3.0'
+networkx==2.3

requirements.txt

@@ -9,5 +9,5 @@ osc-lib>=1.8.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 keystoneauth1>=3.4.0 # Apache-2.0
 iso8601>=0.1.11 # MIT
-networkx>=2.3;python_version>='3.4'  # BSD
-pydot>=1.4.1 # BSD
+networkx>=2.3 # BSD
+pydot>=1.4.1 # BSD

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/python-vitrageclient/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,6 +14,8 @@ 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
@@ -23,10 +26,6 @@ packages =
 data_files =
     share = tools/vitrage.bash_completion
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [entry_points]
 console_scripts =
     vitrage = vitrageclient.shell:main
@@ -72,15 +71,6 @@ vitrageclient.formatter.show =
     value = cliff.formatters.value:ValueFormatter
     yaml = cliff.formatters.yaml_format:YAMLFormatter
 
-[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 = vitrageclient/locale
 domain = python-vitrageclient

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)