Default setting for Zeppelin livy.sql interpreter causes RuntimeException

[AtticusJoy]

Ran into another issue when using Zeppelin 9 image. When using the livy interpreter for SQL (%livy.sql), there is a stactrace (java.lang.RuntimeException: Fail to callRemoteFunction, because connection is broken) that prints for any command used. This is a known bug for the zeppelin 9 which is already fixed for zeppelin 0.9.1 release (https://issues.apache.org/jira/browse/ZEPPELIN-5197). Meanwhile, before upgrading after that release, the work around is to change the zeppelin.livy.concurrentSQL Livy interpreter setting to true.