RM should point tracking URL to RM web page when app fails to start

Similar to YARN-165, the RM should redirect the tracking URL to the specific app page on the RM web UI when the application fails to start. For example, if the AM completely fails to start due to bad AM config or bad job config like invalid queuename, then the user gets the unhelpful "The requested application exited before setting a tracking URL".

Usually the diagnostic string on the RM app page has something useful, so we might as well point there.