ICE-9383, ICE-9354 When running in servlet environment the ExtendedExceptionHandler will always replace a ViewExpiredException with a SessionExpiredException, regardless of the session state.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@36459 1de00972-ac04-4911-a46b-06793c8d78d9
ICE-9383, ICE-9354 Adjust if statements to reflect portal environment behaviour post #36348 commit and servlet environment behaviour to pre #36348 commit.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@36463 1de00972-ac04-4911-a46b-06793c8d78d9
ICE-9383, ICE-9354  Extra check to detect push related rquests useful in portal environment.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@36466 1de00972-ac04-4911-a46b-06793c8d78d9