[ZEPPELIN-4733] Upgrade jetty 9.4.18.v20190429  to 9.4.27.v20200227
[ZEPPELIN-4733] Upgrade jetty 9.4.18.v20190429  to 9.4.27.v20200227

### What is this PR for?
 jetty improvement eclipse/jetty.project#3892

### What type of PR is it?
Improvement

### Todos
* [ ] - Task

### What is the Jira issue?
* ZEPPELIN-4733

### How should this be tested?
* https://travis-ci.org/github/ChowXu/zeppelin/builds/672386044

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

Author: xuzhou <xuzhou@xiaohongshu.com>

Closes #3725 from ChowXu/ZEPPELIN-4733 and squashes the following commits:

e6458782d [xuzhou] [ZEPPELIN-4733]Upgrade jetty 9.4.18.v20190429  to 9.4.27.v20200227

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