Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/postgresql/metadata.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+name              'postgresql'
+maintainer        'Sous Chefs'
+maintainer_email  'help@sous-chefs.org'
+license           'Apache-2.0'
+description       'Installs and configures postgresql for clients or servers'
+long_description  IO.read(File.join(File.dirname(__FILE__), 'README.md'))
+version           '7.1.4'
+source_url        'https://github.com/sous-chefs/postgresql'
+issues_url        'https://github.com/sous-chefs/postgresql/issues'
+chef_version      '>= 13.8'
+
+%w(ubuntu debian fedora amazon redhat centos scientific oracle).each do |os|
+  supports os
+end