[ZEPPELIN-4239] Fix `netty-all-4.0.23.Final.jar` version conflict
[ZEPPELIN-4239] Fix `netty-all-4.0.23.Final.jar` version conflict

### What is this PR for?
Cluster mode depends on `netty-*-4.1.27.Final.jar` and zeppelin-zengine's `netty-all-4.0.23.Final.jar` version conflicts

### What type of PR is it?
[Bug Fix]

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-4239

### How should this be tested?
* [CI pass](https://travis-ci.org/liuxunorg/zeppelin/builds/558725065)

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update?
* Is there breaking changes for older versions?
* Does this needs documentation?

Author: Xun Liu <liuxun@apache.org>

Closes #3406 from liuxunorg/ZEPPELIN-4239 and squashes the following commits:

e549e67cf [Xun Liu] [ZEPPELIN-4239] Fix netty-all-4.0.23.Final.jar version conflict

jongyoul/incubator-zeppelin,apache/incubator-zeppelin,joroKr21/incubator-zeppelin,joroKr21/incubator-zeppelin,mwkang/zeppelin,VipinRathor/zeppelin,prabhjyotsingh/zeppelin,apache/zeppelin,jongyoul/zeppelin,prabhjyotsingh/zeppelin,prabhjyotsingh/incubator-zeppelin,zjffdu/zeppelin,karuppayya/zeppelin,hammertank/zeppelin,zetaris/zeppelin,zjffdu/zeppelin,apache/incubator-zeppelin,mwkang/zeppelin,joroKr21/incubator-zeppelin,Leemoonsoo/zeppelin,joroKr21/incubator-zeppelin,VipinRathor/zeppelin,VipinRathor/zeppelin,joroKr21/incubator-zeppelin,prabhjyotsingh/zeppelin,fogbeam/zeppelin_mirror,zjffdu/zeppelin,fogbeam/zeppelin_mirror,prabhjyotsingh/zeppelin,mwkang/zeppelin,karuppayya/zeppelin,prabhjyotsingh/zeppelin,zetaris/zeppelin,fogbeam/zeppelin_mirror,Leemoonsoo/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,zetaris/zeppelin,hammertank/zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,prabhjyotsingh/incubator-zeppelin,apache/zeppelin,hammertank/zeppelin,hammertank/zeppelin,apache/zeppelin,apache/zeppelin,apache/incubator-zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,hammertank/zeppelin,prabhjyotsingh/incubator-zeppelin,zjffdu/zeppelin,joroKr21/incubator-zeppelin,fogbeam/zeppelin_mirror,mwkang/zeppelin,zetaris/zeppelin,VipinRathor/zeppelin,mwkang/zeppelin,jongyoul/zeppelin,jongyoul/incubator-zeppelin,apache/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,Leemoonsoo/zeppelin,joroKr21/incubator-zeppelin,VipinRathor/zeppelin,zjffdu/zeppelin,hammertank/zeppelin,jongyoul/incubator-zeppelin,karuppayya/zeppelin,jongyoul/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,fogbeam/zeppelin_mirror,jongyoul/incubator-zeppelin,apache/zeppelin,Leemoonsoo/incubator-zeppelin,VipinRathor/zeppelin,hammertank/zeppelin,karuppayya/zeppelin,fogbeam/zeppelin_mirror,VipinRathor/zeppelin,Leemoonsoo/zeppelin,Leemoonsoo/incubator-zeppelin,Leemoonsoo/zeppelin,zetaris/zeppelin,apache/zeppelin,karuppayya/zeppelin,Leemoonsoo/zeppelin,Leemoonsoo/incubator-zeppelin,prabhjyotsingh/zeppelin,Leemoonsoo/incubator-zeppelin,zjffdu/zeppelin,Leemoonsoo/zeppelin,fogbeam/zeppelin_mirror,prabhjyotsingh/zeppelin,zetaris/zeppelin,Leemoonsoo/zeppelin,zetaris/zeppelin,apache/incubator-zeppelin,apache/zeppelin,karuppayya/zeppelin,mwkang/zeppelin,zjffdu/zeppelin,apache/incubator-zeppelin,mwkang/zeppelin,Leemoonsoo/zeppelin,jongyoul/incubator-zeppelin,jongyoul/zeppelin,joroKr21/incubator-zeppelin,karuppayya/zeppelin