Small cleanups after Python2 drop

Remove requirements only needed by Python prior to version 3.5.
Remove python 2.7 code from setup.py.

Remove from setup.py ancient sections.

Change-Id: Ie223b743a0f8def53874bfbbb5f9000ad26f030b

doc/requirements.txt

@@ -1,8 +1,7 @@
 # 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>=1.8.0,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
 openstackdocstheme>=1.20.0 # Apache-2.0
 beautifulsoup4>=4.6.0 # MIT

requirements.txt

@@ -13,8 +13,6 @@ keystoneauth1>=3.18.0 # Apache-2.0
 munch>=2.1.0 # MIT
 decorator>=4.4.1 # BSD
 jmespath>=0.9.0 # MIT
-ipaddress>=1.0.17;python_version<'3.3' # PSF
-futures>=3.0.0;python_version=='2.7' or python_version=='2.6' # BSD
 iso8601>=0.1.11 # MIT
 netifaces>=0.10.4 # MIT
 

setup.cfg

@@ -27,15 +27,3 @@ packages =
 [entry_points]
 console_scripts =
     openstack-inventory = openstack.cloud.cmd.inventory:main
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-warning-is-error = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
-[wheel]
-universal = 1

setup.py

@@ -16,14 +16,6 @@
 # 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)