Finish removing legacy credentials

Change I8c24cd17f643083dde71ab2bd2a38417c54aeccb removed deprecated
legacy configured credentials, but a couple of dependencies were
overlooked. Removing them to complete the clean-up.

Note that this breaks stress for tests not marked as 'use_admin',
but since the stress test is going be depreacted, this should be
acceptable.

Change-Id: Ie814de56d588e438c375ee87e8b5994c6c364c19
2 files changed