Overhaul Python package metadata

Modernize our package metadata in the following ways:

* switch from description-file to long_description with the file
  attribute, and specify an explicit content type and encoding

* replace the home-page parameter with the newer general url one

* add specific labelled project links for improved navigation from
  PyPI's summary sidebar

* include some appropriate keywords to help folks searching

* use the specific license metadata in addition to the corresponding
  trove classifier for it

* make sure wheels when built also incorporate the LICENSE and
  AUTHORS files so that we're not distributing them without a copy
  of the license text

* indicate support for MacOS X/Darwin in trove classifiers

https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html

Also adjust tox.ini to no longer pick a specific Python 3.x
interpreter in the default envs list, instead making it use whatever
python3 the developer has on hand since that's probably "good
enough" for local testing.

Change-Id: Ib509016b532ec7cf65472cf3ee9a5e1b29949534

setup.cfg

@@ -1,32 +1,46 @@
 [metadata]
 name = bindep
 summary = Binary dependency utility
-description-file =
-    README.rst
-author = OpenStack Developer Community
-author-email = openstack-discuss@lists.openstack.org
-home-page = http://docs.openstack.org/infra/bindep
+long_description = file: README.rst
+long_description_content_type = text/x-rst; charset=UTF-8
+author = OpenDev Contributors
+author-email = service-discuss@lists.opendev.org
+url = https://docs.opendev.org/opendev/bindep
+project_urls =
+    Browse Source = https://opendev.org/opendev/bindep
+    Bug Reporting = https://storyboard.openstack.org/#!/project/opendev/bindep
+    Documentation = https://docs.opendev.org/opendev/bindep
+    Git Clone URL = https://opendev.org/opendev/bindep
+    License Texts = https://opendev.org/opendev/bindep/src/branch/master/LICENSE
+    Release Notes = https://docs.opendev.org/opendev/bindep/latest/releasenotes.html
+keywords = binary dependency distribution distro package commandline
+license = Apache License, Version 2.0
+license_files =
+    AUTHORS
+    LICENSE
 classifier = 
     Development Status :: 5 - Production/Stable
     Environment :: Console
-    Environment :: OpenStack
     Intended Audience :: Developers
     Intended Audience :: Information Technology
     License :: OSI Approved :: Apache Software License
+    Operating System :: MacOS :: MacOS X
     Operating System :: POSIX :: Linux
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
-    Programming Language :: Python :: Implementation :: PyPy
+    Topic :: Software Development :: Quality Assurance
     Topic :: Software Development :: Testing
     Topic :: System :: Archiving :: Packaging
     Topic :: Utilities
 
 [files]
-packages =
-    bindep
+packages = bindep
 
 [pbr]
 warnerrors = True
@@ -37,11 +51,3 @@ console_scripts =
 
 [wheel]
 universal = 1
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 min_version = 3.1
-envlist = py35,py27,pypy,pep8
+envlist = py3,py27,pep8
 skipdist = True
 ignore_basepython_conflict=true