fix: Use nginx for zabbix

1. For more details
https://gist.github.com/mccuistion/092bd8b2bb7bc538e67c

commit 3f4b95a4deaaa25fb3a5358545fa095325a57499
Author: Alex Vinnik <alex.vinnik@infochimps.com>
Date:   Thu Mar 20 13:40:55 2014 -0500

    Use nginx for zabbix

    Change-Id: I95ec6d96c6bb8ee33cb1d0c2a1e59affa7a7828e

Change-Id: I47f76bd35b46401d04c071e3448e628fad6483eb