Adjusting specs to use new EZID credentials

The specs were failing for two reasons:
1) The VCR cassette had incorrectly configured credentials
2) The VCR cassette's payload was not correct, because the payload
was being dynamically created via NOID minting.
Merge pull request #454 from projecthydra/feature/tidying-up-remote-service-work

Adjusting specs to use new EZID credentials