Fix implicit dependency on firewall cookbook in kosmos-base

Also delete ufw cookbook, we're not using it

cookbooks/firewall/attributes/iptables.rb

@@ -1,14 +1,14 @@
 default['firewall']['iptables']['defaults'][:policy] = {
   input: 'DROP',
   forward: 'DROP',
-  output: 'ACCEPT'
+  output: 'ACCEPT',
 }
 default['firewall']['iptables']['defaults'][:ruleset] = {
   '*filter' => 1,
   ":INPUT #{node['firewall']['iptables']['defaults'][:policy][:input]}" => 2,
   ":FORWARD #{node['firewall']['iptables']['defaults'][:policy][:forward]}" => 3,
   ":OUTPUT #{node['firewall']['iptables']['defaults'][:policy][:output]}" => 4,
-  'COMMIT_FILTER' => 100
+  'COMMIT_FILTER' => 100,
 }
 
 default['firewall']['ubuntu_iptables'] = false