[ZEPPELIN-2461] Masking Jetty Server version with User-configurable parameter
### What is this PR for?
Security conscious organisations does not want to reveal the Application Server
name and version to prevent Script-kiddies from finding the information easily
when fingerprinting the Applicatio
Repository: zeppelin
Updated Branches:
refs/heads/master 82c92d110 -> 62aec9fbd
[ZEPPELIN-2461] Masking Jetty Server version with User-configurable parameter
### What is this PR for?
Security conscious organisations does not want to reveal the Application Server
name and version to prevent Sc