remove nginx -V check; add pillar example

nginx/templates/config.jinja

 }
 
 http {
-    {% if 'set_real_ips' in nginx and salt['cmd.retcode']('nginx -V 2>&1 | grep http_realip_module') == 0 -%}
+    {% if 'set_real_ips' in nginx -%}
     {% for ip in nginx.get('set_real_ips', {}).get('ips', []) -%}
     set_real_ip_from {{ ip }};
     {% endfor -%}

pillar.example

   use_upstart: True
   with_luajit: False
   with_openresty: True
+  set_real_ips: # NOTE: to use this, nginx must have http_realip module enabled
+    ips:
+      - 10.10.10.0/24
+    real_ip_header: X-Forwarded-For
   modules:
     headers-more:
       source: http://github.com/agentzh/headers-more-nginx-module/tarball/v0.21