Cleanup Python 2.7 support

OpenStack is dropping the py2.7 support in ussuri cycle.

Make a few cleanups:
- Remove python 2.7 stanza from setup.py
- Add python-requires to setup.cfg so that pypi and pip know
  about support Python version
- Remove ancient sections from setup.cfg
- Remove version_info setting from conf.py, openstackdocstheme does this
  automatically nowadays.

Change-Id: I5b9c159752c932f874015f20822862c70562c2bd

doc/source/conf.py

@@ -12,8 +12,6 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import pbr.version
-
 # -- General configuration ----------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -55,17 +53,6 @@ master_doc = 'index'
 project = u'OpenStack Command Line Client'
 copyright = u'2012-2013 OpenStack Foundation'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-version_info = pbr.version.VersionInfo('python-openstackclient')
-#
-# The short X.Y version.
-version = version_info.version_string()
-# The full version, including alpha/beta/rc tags.
-release = version_info.release_string()
-
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #language = None

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/python-openstackclient/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -715,9 +716,6 @@ openstack.volume.v3 =
     volume_transfer_request_list = openstackclient.volume.v2.volume_transfer_request:ListTransferRequest
     volume_transfer_request_show = openstackclient.volume.v2.volume_transfer_request:ShowTransferRequest
 
-[upload_sphinx]
-upload-dir = doc/build/html
-
 [extract_messages]
 keywords = _ gettext ngettext l_ lazy_gettext
 mapping_file = babel.cfg

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)