Merge "setup.cfg: Replace dashes with underscores"

setup.cfg

 [metadata]
 name = oslo.limit
 summary = Limit enforcement library to assist with quota calculation.
-description-file =
+description_file =
     README.rst
 author = OpenStack
-author-email = openstack-discuss@lists.openstack.org
-home-page = https://docs.openstack.org/oslo.limit/latest/
-python-requires = >=3.6
+author_email = openstack-discuss@lists.openstack.org
+home_page = https://docs.openstack.org/oslo.limit/latest/
+python_requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology