check for bad cloud token

[stevevanhooser]

Right now, if the token is empty, we attempt to request a new one. We don't check ahead of time for a bad or expired token; if we did (for example, in ndi.cloud.api.call), then we might save our users some grief.

(mentioned by @jesshaley )

[stevevanhooser]

We could even use an environment variable to indicate the check out time of the token and check out a new one early if it gets close. I think we do this already but maybe the prod and dev are different and that's why people lose tokens in the prod