Remove redundant test order option

The test order is now random by default.

config/environments/test.rb

@@ -38,9 +38,6 @@ Rails.application.configure do
   }
   config.action_mailer.asset_host = "http://consul.test"
 
-  # Randomize the order test cases are executed.
-  config.active_support.test_order = :random
-
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr