MYFACES-4660 4.0 view destroying fix + keeping track of user connection in multiple tabs

[milansie]

1/ when the view is destroyed (i.e. the user reaches the NUMBER_OF_VIEWS_IN_SESSION limit), sessionScope channels are not destroyed. Channel could still be active for other views or newly created ones. In other words, session-scoped channels only get destroyed when the entire session is destroyed.

2/ we have to track number of user channelToken usage connections (when the user is using same channelToken in multiple browser windows / tabs with same http session, the channelToken remains same), and we can't close this channel until all user connections to this channel are closed (all tabs/windows).