Set correct ACL for Swift staticweb tests

The staticweb middleware in Swift needs a small fix, and due to this one needs
to make listings public readable too when using staticweb listings.
This patch sets the correct ACL for this.

See also: https://review.openstack.org/#/c/227204/
Related-Bug: 1489749

Change-Id: Ie24bb995023c377e49796910ad80a256b00daa03
diff --git a/tempest/api/object_storage/test_container_staticweb.py b/tempest/api/object_storage/test_container_staticweb.py
index 4b4b499..18593f3 100644
--- a/tempest/api/object_storage/test_container_staticweb.py
+++ b/tempest/api/object_storage/test_container_staticweb.py
@@ -28,7 +28,7 @@
         cls.container_name = data_utils.rand_name(name="TestContainer")
 
         # This header should be posted on the container before every test
-        cls.headers_public_read_acl = {'Read': '.r:*'}
+        cls.headers_public_read_acl = {'Read': '.r:*,.rlistings'}
 
         # Create test container and create one object in it
         cls.container_client.create_container(cls.container_name)