Evacuate most metadata out of setup.cfg

Lots of tools assume the existence of a pyproject.toml means package
metadata will be specified there. Do that, and leave a minimal
setup.cfg behind that just keeps the one key PBR crashes without.

Change-Id: I3f4fba1ee5be8416db67f396492d5d6dd04983a7

pyproject.toml

@@ -1,3 +1,62 @@
 [build-system]
 requires = ["pbr>=6.1.1"]
 build-backend = "pbr.build"
+
+[project]
+authors = [
+    {email = "service-discuss@lists.opendev.org"},
+    {name = "OpenDev Contributors"},
+]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "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 :: 3",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Topic :: Software Development :: Quality Assurance",
+    "Topic :: Software Development :: Testing",
+    "Topic :: System :: Archiving :: Packaging",
+    "Topic :: Utilities",
+]
+description = "Binary dependency utility"
+dynamic = ["dependencies", "version"]
+keywords = [
+    "binary",
+    "commandline",
+    "dependency",
+    "distribution",
+    "distro",
+    "package",
+]
+# TODO: Add 'license-expression = "Apache-2.0"' here and drop the License
+# classifier once https://github.com/pypa/setuptools/issues/4629 is resolved.
+maintainers = [
+    {email = "service-discuss@lists.opendev.org"},
+    {name = "OpenDev Contributors"},
+]
+name = "bindep"
+readme = {charset = "UTF-8", content-type = "text/x-rst", file = "README.rst"}
+requires-python = ">=3.6"
+
+[project.scripts]
+bindep = "bindep.__main__:main"
+
+[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"

setup.cfg

@@ -1,60 +1,12 @@
+# TODO: Drop this section once PBR can read project names from pyproject.toml
 [metadata]
 name = bindep
-summary = Binary dependency utility
-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
-    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 :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.11
-    Programming Language :: Python :: 3.12
-    Programming Language :: Python :: 3.13
-    Programming Language :: Python :: Implementation :: CPython
-    Topic :: Software Development :: Quality Assurance
-    Topic :: Software Development :: Testing
-    Topic :: System :: Archiving :: Packaging
-    Topic :: Utilities
-python_requires = >=3.6
 
+# TODO: Drop this section once we no longer support Python 3.6
 [options]
 py_modules = bindep
 
-[pbr]
+# TODO: Drop this section once we no longer support Python 3.6
-warnerrors = True
-
 [entry_points]
 console_scripts =
     bindep = bindep.__main__:main
-
-[flake8]
-# E123, E125 skipped as they are invalid PEP-8.
-show-source = True
-ignore = E123,E125,E129,H,W503,W504
-builtins = _
-exclude=.venv,.git,.nox,.tox,dist,doc,*lib/python*,*egg,build