AMBARI-1212. After successful install with Ambari, the user is taken to the welcome page of the Install Wizard upon browser relaunch if the HTTP session is expired. (yusaku)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/trunk@1435458 13f79535-47bb-0310-9956-ffa450edef68