Work around issue in vagrant-aws

URL: mitchellh/vagrant-aws#566
Signed-off-by: Samuli Seppänen <[email protected]>

Vagrantfile

@@ -1,6 +1,18 @@
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 
+# Workaround https://github.com/mitchellh/vagrant-aws/issues/566
+class Hash
+  def slice(*keep_keys)
+    h = {}
+    keep_keys.each { |key| h[key] = fetch(key) if has_key?(key) }
+    h
+  end unless Hash.method_defined?(:slice)
+  def except(*less_keys)
+    slice(*keys - less_keys)
+  end unless Hash.method_defined?(:except)
+end
+
 Vagrant.configure("2") do |config|
 
   config.vm.define "packager" do |box|