[BZ 970181] - RHQ doesn't work after restart with open GUI in web browser. - if the server restarts at the background, the session id is lost on the server therefore we can't allow the logged user to continue sending the requests without a new AuthN. It would be a security risk to allow it. Now, if the server restarts the UI requires the new log in (the login form is displayed).

(cherry picked from commit 50aed986a19b2e1cbd7d13e179c0342857d22854)
Signed-off-by: Libor Zoubek <lzoubek@redhat.com>
UI: Improvement to auto refreshable views: the refresh() method is not performed if the session has expired. If the user logs in again the refresh() method will be regularly called again.

(cherry picked from commit 25706c31e65c006eb0b2c08ef5686bb70566964a)
Signed-off-by: Libor Zoubek <lzoubek@redhat.com>