Remove setup.py and setup.cfg

Theses used to be used for building docs in the past and were made
obsolete with change Icc65afd5f6c0e22147b179c16d6a4fa5f47954ce.

A recent release of setuptools 61.0.0 introduced a breaking change [1]
which caused our openstack-tox-docs and openstack-tox-pep8 jobs to fail
with:

  error: Multiple top-level packages discovered in a flat-layout:
    ['specs', 'priorities'].

This removes setup.py and setup.cfg from use in tox.ini to resolve the
issue and they are not needed anyway.

Related-Bug: #1966382

[1] https://github.com/pypa/setuptools/issues/3197

Change-Id: Ib90065a62bdef235e83173c73894c478af0df5fa

setup.cfg

@@ -1,12 +0,0 @@
-[metadata]
-name = nova-specs
-summary = OpenStack Nova Project Development Specs
-description_file =
-    README.rst
-author = OpenStack
-author_email = openstack-discuss@lists.openstack.org
-home_page = http://specs.openstack.org/openstack/nova-specs/
-classifier =
-    Intended Audience :: Developers
-    License :: OSI Approved :: Apache Software License
-    Operating System :: POSIX :: Linux

setup.py

@@ -1,20 +0,0 @@
-# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import setuptools
-
-setuptools.setup(
-    setup_requires=['pbr>=2.0'],
-    pbr=True)

tox.ini

@@ -5,7 +5,7 @@ skipsdist = True
 
 [testenv]
 basepython = python3
-usedevelop = True
+#usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/doc/requirements.txt
 allowlist_externals =