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
1 file changed