Add setup.cfg and pbr support.

This patch fix a bug when installing a swift3 on
devstack.

Because devstack uses pbr/requirements.txt to
sync global requirements, we need to add setup.cfg and
pbr support to swift3 so it can be installed on devstack.

This also allow to take advantage of the pbr facilities
(version number support, etc)

Change-Id: Id0179fad179efac5ba85bef7838365a4d304d196

requirements.txt

@@ -0,0 +1 @@
+swift>=1.8

setup.cfg

@@ -0,0 +1,32 @@
+[metadata]
+name = swift3
+version = 1.7.0
+summary = Swift AmazonS3 API emulation Middleware
+description-file =
+    README.md
+author = OpenStack Foundation
+author-email = openstack-dev@lists.openstack.org
+home-page = https://github.com/stackforge/swift3
+classifier =
+    Development Status :: 5 - Production/Stable
+    Environment :: OpenStack
+    Intended Audience :: Information Technology
+    Intended Audience :: System Administrators
+    License :: OSI Approved :: Apache Software License
+    Operating System :: POSIX :: Linux
+    Programming Language :: Python
+    Programming Language :: Python :: 2
+    Programming Language :: Python :: 2.6
+    Programming Language :: Python :: 2.7
+
+[pbr]
+skip_authors = True
+skip_changelog = True
+
+[files]
+packages =
+    swift3
+
+[entry_points]
+paste.filter_factory =
+    swift3 = swift3.middleware:filter_factory

setup.py

@@ -9,22 +9,13 @@
 #
 # 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.
+# 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.
 
-from setuptools import setup
+import setuptools
 
-import swift3
-
-
-setup(name='swift3',
-      version=swift3.version,
-      description='Swift AmazonS3 API emulation Middleware',
-      author='OpenStack Foundation',
-      author_email='openstack-dev@lists.openstack.org',
-      url='https://github.com/stackforge/swift3',
-      packages=['swift3'],
-      requires=['swift(>=1.4)'],
-      entry_points={'paste.filter_factory':
-          ['swift3=swift3.middleware:filter_factory']})
+setuptools.setup(
+    setup_requires=['pbr'],
+    pbr=True)

swift3/__init__.py

@@ -15,10 +15,17 @@
 """
 Static Web Middleware for OpenStack Swift
 """
+import pbr.version
 
 __all__ = ['version_info', 'version']
 
-#: Version information ``(major, minor, revision)``.
-version_info = (1, 7, 0)
+# get version info using pbr.version.
+# pbr version info is inferred from version in setup.cfg
+# and vcs information.
+_version_info = pbr.version.VersionInfo('swift3')
+
 #: Version string ``'major.minor.revision'``.
-version = '.'.join(map(str, version_info))
+version = _version_info.version_string()
+
+#: Version information ``(major, minor, revision)``.
+version_info = version.split('.')