add more logging to userdetails responses

[adam-collins]

/occurrences/offline/download has been returning status code 400, message No valid email when there are frequent requests.

A comparison between biocache-service logs and userdetails logs indicate that the request for user information may be interrupted before the request is received because the 400 response is always given at 5s and it is not certain userdetails has a record of it. More logging is required to be certain.

1. Add more logging to getUserByEmailOrId.
2. Fix use of cached lookupAuthUser result. While not applicable to this service, it can cache the not found error.
3. Add config to control the timeout of restTemplate.

[adam-collins]

Reducing scope to just the logging. The underlying issue was with the auth system and it was resolved shortly after this issue was created.