Merge "setup.cfg: Replace dashes by underscores"

setup.cfg

 [metadata]
 name = oslo.upgradecheck
 summary = Common code for writing OpenStack upgrade checks
-description-file =
+description_file =
     README.rst
 author = OpenStack
-author-email = openstack-discuss@lists.openstack.org
-home-page = http://launchpad.net/oslo
-python-requires = >=3.6
+author_email = openstack-discuss@lists.openstack.org
+home_page = http://launchpad.net/oslo
+python_requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology