cc/ @catsby if you're curious. That fixed the acceptance tests,
thought there is still one (different issue) that is still failing.
Also, it nows construct a transport instead of using the default
and setting the auth globally. TF could potentially run things
concurrently and that might go wrong.
cc/ @bmarini
Basically, the attr check we have in our tests is looking at resources
that we specify. It's basically check that "if I send this, I get this"
from the external resource.
In this case, we don't know what the token will be, so we can't
do it that way. I replaced it with a "make sure this is more than an
empty string" assertion.