Create nginx user

Only relevant when bringing it up from scratch,
so this went undetected until we tried that again...

Author: adriaanm

recipes/_master-config-proxy.rb

@@ -13,6 +13,8 @@
 
 package "nginx"
 
+user "nginx"
+
 template '/etc/nginx/nginx.conf' do
   source 'nginx.conf'
   notifies :reload, "service[nginx]"