Add tests for ex_userdata argument.
Add tests for ex_userdata argument.

apache/libcloud,apache/libcloud,andrewsomething/libcloud,andrewsomething/libcloud,mistio/libcloud,apache/libcloud,Kami/libcloud,mistio/libcloud,andrewsomething/libcloud,Kami/libcloud,mistio/libcloud,Kami/libcloud