Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/nginx/templates/default/modules/nginx_status.erb

@@ -1,18 +0,0 @@
-include authorized_ip;
-
-server {
-  listen <%= node['nginx']['status']['port'] %>;
-  server_name _;
-
-  location /nginx_status {
-    if ($authorized_ip = no) {
-      return 404;
-    }
-    stub_status on;
-    access_log off;
-  }
-
-  location / {
-    return 404;
-  }
-}