Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/selinux/templates/default/sysconfig/selinux.erb

@@ -1,11 +0,0 @@
-# This file controls the state of SELinux on the system.
-# SELINUX= can take one of these three values:
-#       enforcing - SELinux security policy is enforced.
-#       permissive - SELinux prints warnings instead of enforcing.
-#       disabled - SELinux is fully disabled.
-SELINUX=<%= @selinux %>
-# SELINUXTYPE= type of policy in use. Possible values are:
-#       targeted - Only targeted network daemons are protected.
-#       strict - Full SELinux protection.
-SELINUXTYPE=<%= @selinuxtype %>
-