Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/apache2/templates/default/mods/proxy_balancer.conf.erb

@@ -1,18 +0,0 @@
-<IfModule mod_proxy_balancer.c>
-  # Balancer manager enables dynamic update of balancer members
-  # (needs mod_status). Uncomment to enable.
-  #
-  #<IfModule mod_status.c>
-  #   <Location /balancer-manager>
-  #     SetHandler balancer-manager
-<% if node['apache']['version'] == '2.4' -%>
-  #     Require local
-<% else -%>
-  #     Order deny,allow
-  #     Deny from all
-  #     Allow from 127.0.0.1 ::1
-  #     Satisfy all
-<% end -%>
-  #   </Location>
-  #</IfModule>
-</IfModule>