Remove transition logic for old tempest option renaming

This logic was required to adopt to the renaming in tempest[1] which
was done in 12.0.0 release. Now the minimum tempest version required
is much higher so we no longer need this compatibility consideration.

[1] ed6e586b9f8f0ada10af7711f297afa01b2b7754

Change-Id: I5d13f9146b00b2fcd5c2e96071ab914b8a56a089
3 files changed