AMBARI-2274. MySQL server is installed on the Hive Metastore host even if the user selects the "existing DB" option. (Oleg Nechiporenko via yusaku)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/trunk@1489535 13f79535-47bb-0310-9956-ffa450edef68