Cleanup python 2.7 support

* Remove six usage
* Remove python 2.7 stanza from setup.py
* Update supported python versions in setup.cfg
* Remove i18n related sections in setup.cfg
  as tempest-horizon has no translation support
* Remove unused requirements (oslo_log and babel) from requirements.txt

Change-Id: Ifd530546bfb5ae25e01e72a0e3c02f963d9d04d2
diff --git a/setup.cfg b/setup.cfg
index 88a6eab..d2c1556 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,7 +5,7 @@
     README.rst
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
-home-page = http://www.openstack.org/
+home-page = https://opendev.org/openstack/tempest-horizon
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,29 +13,14 @@
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.3
-    Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
 
 [files]
 packages =
     tempest_horizon
+
 [entry_points]
 tempest.test_plugins =
     horizon = tempest_horizon.plugin:HorizonTempestPlugin
-
-[compile_catalog]
-directory = tempest_horizon/locale
-domain = tempest_horizon
-
-[update_catalog]
-domain = tempest_horizon
-output_dir = tempest_horizon/locale
-input_file = tempest_horizon/locale/tempest_horizon.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = tempest_horizon/locale/tempest_horizon.pot