Switch to int_date for acceptance test

`Randomized_Requests` has problems to be installed in newer versions
thus lets just switch to a different pip which includes a underscore.

Author: baurmatt

spec/acceptance/virtualenv_spec.rb

@@ -94,7 +94,7 @@ class { 'python' :
         owner      => 'root',
         group      => 'root',
       }
-      -> python::pip { 'Randomized_Requests' :
+      -> python::pip { 'int_date' :
         ensure     => 'latest',
         virtualenv => '/opt/venv4',
       }