Changes

mme: Fix order in eutran_to_geran testcase

The diagram shows that the S1-AP release should happen after the Delete
Session Request/Response (even though all a numbered 13).

The test started failing because a newer open5gs would check/require a
resource that was freed due to an S1 release.

Change-Id: I0d7a388dc8b1a1c13de8f7e3fe7781423fc90868