Fix pep8 compliance

This commits fixes some pep8 linters that were missing and makes it
pep8-compliant.

Change-Id: Ib50d7a3cdeadffa7db76e7e188d081eb313802b9

config_tempest/api_discovery.py

@@ -206,4 +206,3 @@ def discover(auth_provider, region, object_store_discovery=True,
             services[name]['extensions'] = service.get_extensions()
         services[name]['versions'] = service.get_versions()
     return services
-

config_tempest/config_tempest.py

@@ -847,4 +847,3 @@ def _find_image(client, image_id, image_name):
 
 if __name__ == "__main__":
     main()
-