DLP tests do not run on Kokoro.

[SurferJeffAtGoogle]

[dzlier-gcp]

Some of the failing tests are due to this commit, which removed the setup code that ensures that a KMS keyring/key exists for the tests and then uses it to create a wrapped key (cipher file). @ace-n , please re-add the code so that these tests pass again.

[pheonixblade9]

This is still an issue. Please fix.

[amanda-tarafa]

Note to self: this might be relevant: https://stackoverflow.com/questions/60471428/gcp-dlpdata-loss-prevention-getting-decryption-failed-the-ciphertext-is-inva/60513800#60513800