Do not vendor cookbooks using Berkshelf anymore

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

cookbooks/firewall/libraries/resource_firewall.rb

@@ -1,26 +0,0 @@
-class Chef
-  class Resource::Firewall < Chef::Resource::LWRPBase
-    resource_name(:firewall)
-    provides(:firewall)
-    actions(:install, :restart, :disable, :flush, :save)
-    default_action(:install)
-
-    # allow both kinds of logic -- eventually remove the :disabled one.
-    # the positive logic is much easier to follow.
-    attribute(:disabled, kind_of: [TrueClass, FalseClass], default: false)
-    attribute(:enabled, kind_of: [TrueClass, FalseClass], default: true)
-
-    attribute(:log_level, kind_of: Symbol, equal_to: [:low, :medium, :high, :full, :off], default: :low)
-    attribute(:rules, kind_of: Hash)
-
-    # for firewalld, specify the zone when firewall is disable and enabled
-    attribute(:disabled_zone, kind_of: Symbol, default: :public)
-    attribute(:enabled_zone, kind_of: Symbol, default: :drop)
-
-    # for firewall implementations where ipv6 can be skipped (currently iptables-specific)
-    attribute(:ipv6_enabled, kind_of: [TrueClass, FalseClass], default: true)
-
-    # allow override of package options for firewalld package
-    attribute(:package_options, kind_of: String, default: nil)
-  end
-end