add msc_vlr tests for UMTS without ciphering

Following I04ecd7a3b1cc603b2e3feb630e8c7c93fc36ccd7, have tests for UMTS
authentication both for cases with and without encryption.

- Rename test_umts_authen_utran to test_umts_auth_ciph_utran() (uses
  encryption).
- Again add test_umts_authen_utran() not using encryption.
- Likewise with test_umts_authen_resync_utran().

Some permutations are still missing, like UMTS AKA on GERAN with encryption
enabled; not bothering at the moment.

Related: OS#2783
Change-Id: I54227f1f08c38c0bf69b9c48924669c4829b04b9
2 files changed