HST eventlisteners should be registered with non-pooled HST session

At this moment, the EventListenersContainerImpl registers all hst eventlisteners with an hst config user session coming from session pool : this is very undesirable as sessions from a pool will be logged out after

hstconfigreader.repository.maxTimeToLiveMillis

after which the listeners will have to be registered again.

Using a 'delegated jcr session' avoids this as these do not come from the session pool