Merge "setup.cfg: Replace dashes with underscores"

setup.cfg

 [metadata]
 name = oslo.metrics
 author = OpenStack
-author-email = openstack-discuss@lists.openstack.org
+author_email = openstack-discuss@lists.openstack.org
 summary = Oslo Metrics API
-description-file =
+description_file =
     README.rst
-home-page = https://opendev.org/openstack/oslo.metrics
-python-requires = >=3.6
+home_page = https://opendev.org/openstack/oslo.metrics
+python_requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Developers