This adds GetCallerIdentity to CreateAccessKey and RotateKeys. The
latter is done simply by passing WithTimeout through to the inner
CreateAccessKey on Rotate. As such, both paths are conditional on a
non-zero WithTimeout option being given - this is to ensure that we
don't try to immediately verify, which is likely to always fail.
This adds GetCallerIdentity to CreateAccessKey and RotateKeys. The latter is done simply by passing WithTimeout through to the inner CreateAccessKey on Rotate. As such, both paths are conditional on a non-zero WithTimeout option being given - this is to ensure that we don't try to immediately verify, which is likely to always fail.