Normalize JSON attributes during update

This change fixes a few issues related to JSON encoding of
FragmentEntity attributes (data leaves). This significantly
improves update performance in cases of partial updates.

- Normalize JSON and order leaves by name when comparing
  data leaves during update operations.
- Update performance test timings.

Issue-ID: CPS-2018
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Ia764a353bf96c05758827845e1358745247ee237