ICE-9451 Implemented Websphere Portal strategy (based on http://wpcertification.blogspot.ro/2010/05/accessing-underlying-httpservletrequest.html document) for accessing the original servlet request.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@37220 1de00972-ac04-4911-a46b-06793c8d78d9