Remove further randomness when calling ddt.data()

Avoid the usage of set to dedeplicate the lists and
instead use the specific utils.deduplicate function,
which preserves the original order.

This is a follow-up of: I9cbd26016238c25487ac8104c1188cd2cf4f467e

Change-Id: I15bfbf6e1ca604f2bf2fcf12dcd4e67bc728fe5e
3 files changed