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/authorized_ip.erb

@@ -1,6 +0,0 @@
-geo $<%= node['nginx']['remote_ip_var'] %> $authorized_ip {
-  default no;
-  <% node['nginx']['authorized_ips'].each do |ip| %>
-  <%= "#{ip} yes;" %>
-  <% end %>
-}