Introduce stub config in validator spec to fix execution of standalone spec test

Author: hoffmaen

spec/unit/messages/validators_spec.rb

@@ -1,4 +1,20 @@
 require 'lightweight_spec_helper'
+
+# Stub Config for lightweight spec (must be before validators.rb is required)
+module VCAP
+  module CloudController
+    class Config
+      def self.config
+        self
+      end
+
+      def self.get(key)
+        'buildpack' if key == :default_app_lifecycle
+      end
+    end
+  end
+end
+
 require 'messages/validators'
 require 'messages/base_message'
 require 'messages/empty_lifecycle_data_message'