[ZEPPELIN-4943]. Support hdfs jars for flink.execution.jars & flink.udf.jars

### What is this PR for?

This PR is to support using hdfs jars for `flink.execution.jars` and `flink.udf.jars`. So that user don't need to copy jars to the zeppelin machine in case that they don't have permission to do that.

### What type of PR is it?
[ Feature ]

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-4943

### How should this be tested?
* Manually tested

### Screenshots (if appropriate)
![image](https://user-images.githubusercontent.com/164491/87223352-c4b2cf00-c3ae-11ea-801f-aa92b0c5f1b3.png)

![image](https://user-images.githubusercontent.com/164491/87223353-c9778300-c3ae-11ea-9e3d-4f2fbbb9fc4e.png)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? NO

Author: Jeff Zhang <zjffdu@apache.org>

Closes #3849 from zjffdu/ZEPPELIN-4943 and squashes the following commits:

23d2a4172 [Jeff Zhang] [ZEPPELIN-4943]. Support hdfs jars for flink.execution.jars & flink.udf.jars
4 files changed
tree: 71ab744b06042efa2b07bce5d8f9d263dca5af81
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README.md

Apache Zeppelin

Documentation: User Guide
Mailing Lists: User and Dev mailing list
Continuous Integration: Build Status
Contributing: Contribution Guide
Issue Tracker: Jira
License: Apache 2.0

Zeppelin, a web-based notebook that enables interactive data analytics. You can make beautiful data-driven, interactive and collaborative documents with SQL, Scala and more.

Core feature:

  • Web based notebook style editor.
  • Built-in Apache Spark support

To know more about Zeppelin, visit our web site https://zeppelin.apache.org

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Install binary package

Please go to install to install Apache Zeppelin from binary package.

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