added element for nginx-plus

Change-Id: I42588a5212038d45517c07492201ae5389b8d3df

diskimage-builder/elements/nginx-plus/README.md

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+Before using this element copy your nginx-repo.key and nginx-repo.crt into ./bin
+
+

diskimage-builder/elements/nginx-plus/element-deps

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+cloud-init-datasources
+source-repositories

diskimage-builder/elements/nginx-plus/pre-install.d/01-nginx-plus

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+#!/bin/bash
+# this is an install script for nginx plus
+
+# make nginx ssl dir
+mkdir /etc/ssl/nginx
+cp $(dirname $0)/../bin/* /etc/ssl/nginx/
+
+wget https://cs.nginx.com/static/files/CA.crt -P /etc/ssl/nginx/
+wget http://nginx.org/keys/nginx_signing.key -P /etc/ssl/nginx/
+
+apt-key add nginx_signing.key
+
+printf "deb https://plus-pkgs.nginx.com/debian `lsb_release -cs` nginx-plus\n" >/etc/apt/sources.list.d/nginx-plus.list
+
+wget https://cs.nginx.com/static/files/90nginx -P /etc/apt/apt.conf.d
+
+apt-get update
+
+apt-get install nginx-plus -y