Add new port net/nuster, a web caching proxy server based on HAProxy

Nuster is a simple yet powerful web caching proxy server based on HAProxy. It
is 100% compatible with HAProxy, and takes full advantage of the ACL
functionality of HAProxy to provide fine-grained caching policy based on the
content of request, response or server status.

WWW: https://github.com/jiangwenyuan/nuster

PR: 225721
Submitted by: Felix Hanley