HBASE-10274 MiniZookeeperCluster should close ZKDatabase when shutdown ZooKeeperServers (chendihao via enis)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1557923 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10320 Avoid ArrayList.iterator() ExplicitColumnTracker

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1557951 13f79535-47bb-0310-9956-ffa450edef68