I wrote these tests but with the new self.os_user I think that we should stop using the global constants and use
cls.os_user.name intead..

same for token... as for uuid, i think that is safe to cache the token on the cls.os_user so that we don't have to re-create it for each test....

we shall see if we have tests which are invalidating a token... but hope we don't have such test.