[mock] simplify stub tests by using %r{} to avoid escaping /
[mock] simplify stub tests by using %r{} to avoid escaping /

cloudfoundry-incubator/excon,hammerdr/excon,liftforward/excon,TheNeatCompany/excon,ilackarms/excon,excon/excon,wadetandy/excon,mahemoff/excon