Use separate directories for unit test-generated credentials vs actual credentials, so the unit test credentials don't interfere with the real ones. related-to-bug: 8620943 Merge of: Update path to where CDM persistently stores data https://widevine-internal-review.googlesource.com/#/c/5300/ Rename Keybox File https://widevine-internal-review.googlesource.com/#/c/5240/ ... from the widevine CDM repo. Change-Id: Idefa484b3a2f71f723238f033460bf431ce4209b