AMBARI-2334. Need to make it clear that ojdbc.jar must be in place before starting server. (Myroslav Papirkovskyy, Oleksandr Diachenko via smohanty)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/branches/branch-1.2.4@1491303 13f79535-47bb-0310-9956-ffa450edef68