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: I45b5b8582b67b39823a6e21221c491842b390b96

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
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD
 openstackdocstheme>=1.30.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0

lower-constraints.txt

@@ -26,7 +26,6 @@ extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
 flake8==2.5.5
-futures==3.0.0
 futurist==1.2.0
 gitdb==0.6.4
 GitPython==1.0.1
@@ -35,7 +34,6 @@ greenlet==0.4.10
 hacking==0.12.0
 httplib2==0.9.1
 idna==2.6
-ipaddress==1.0.17;python_version<'3.3' # PSF
 iso8601==0.1.11
 Jinja2==2.10
 jmespath==0.9.0

requirements.txt

@@ -4,13 +4,11 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
 Babel!=2.4.0,>=2.3.4 # BSD
-ipaddress>=1.0.17;python_version<'3.3' # PSF
 passlib>=1.7.0 # BSD
 psutil>=3.2.2 # BSD
 python-ironic-inspector-client>=1.5.0 # Apache-2.0
 python-heatclient>=1.10.0 # Apache-2.0
-python-ironicclient!=2.5.2,!=2.7.1,!=3.0.0,>=2.3.0,<4.0.0;python_version=='2.7' # Apache-2.0
-python-ironicclient!=2.5.2,!=2.7.1,!=3.0.0,>=2.3.0;python_version>='3.6' # Apache-2.0
+python-ironicclient!=2.5.2,!=2.7.1,!=3.0.0,>=2.3.0 # Apache-2.0
 python-mistralclient!=3.2.0,>=3.1.0 # Apache-2.0
 python-openstackclient>=5.2.0 # Apache-2.0
 simplejson>=3.5.1 # MIT
@@ -19,5 +17,4 @@ osc-lib>=1.8.0 # Apache-2.0
 websocket-client>=0.44.0 # LGPLv2+
 tripleo-common>=12.2.0 # Apache-2.0
 cryptography>=2.1 # BSD/Apache-2.0
-futures>=3.0.0;python_version=='2.7' or python_version=='2.6' # BSD
 ansible-runner>=1.4.4 # Apache 2.0

setup.cfg

@@ -7,6 +7,7 @@ license = Apache License, Version 2.0
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/python-tripleoclient/latest/
+python-requires = >=3.6
 classifier =
     Environment :: Console
     Environment :: OpenStack
@@ -16,6 +17,8 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
     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
@@ -24,9 +27,6 @@ classifier =
 packages =
     tripleoclient
 
-[wheel]
-universal = 1
-
 [compile_catalog]
 directory = tripleoclient/locale
 domain = tripleoclient

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)