add MSC test for an invalid CIPHER MODE COMPLETE command

Add new test TC_cipher_complete_with_invalid_cipher which verifies
that the MSC will reject a CIPHER MODE COMPLETE command with a
cipher which wasn't part of the preceding CIPHER MODE command.

Change-Id: I4492eb7d77371aaa047abae81a2dcf26fe46eb6a
Related: OS#2872
3 files changed