minor, fix clean-up function in metastore.sh
minor, fix clean-up function in metastore.sh

apache/kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin,apache/incubator-kylin,apache/kylin,apache/kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin,apache/kylin,apache/incubator-kylin,apache/kylin