arquillian-openejb-embedded doesn't destroy sessions with application undeployment in embedded http mode

This issues happens when running our cdi-embedded TCK.
In this mode the arquillian adaptor doesn't use tomcat but fires up OpenEJBHttpServer. But during undeploy this server doesn't get used but instead just the OpenWebBeans lifecycle in the WebBeansContext gets shut down.
Due to this the Sessions don't get cleaned up properly. That makes us not only leak memory but also miss a few CDI events which are tested in our TCK.