[ZEPPELIN-5018] Small http config refactoring

### What is this PR for?
This PR includes:
 - Configure RequestHeaderSize directly without cast afterwards
 - Removing the setting of the default values, because it confuses
 -  SecureRequestCustomizer does not need to be stored in an additional variable

### What type of PR is it?
Refactoring

### Todos
* [ ] - Task

### What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-5018

### How should this be tested?
* **Travis-CI**: https://travis-ci.org/github/Reamer/zeppelin/builds/721255684

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

Author: Philipp Dallig <philipp.dallig@gmail.com>

Closes #3888 from Reamer/small_httpConfig_cleanup and squashes the following commits:

8384a65c2 [Philipp Dallig] SecureRequestCustomizer does not need to be stored in an additional variable
77b6ff4ab [Philipp Dallig] Removing the setting of the default values, because it confuses
6b456d620 [Philipp Dallig] Configure RequestHeaderSize directly without cast
1 file changed
tree: 9d9b99adae4756d497a42ffc64519c22f52436b0
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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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