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
diff --git a/msc/MSC_Tests.cfg b/msc/MSC_Tests.cfg
index 5a3c33c..b412889 100644
--- a/msc/MSC_Tests.cfg
+++ b/msc/MSC_Tests.cfg
@@ -60,3 +60,4 @@
 #MSC_Tests.TC_lu_and_mt_call_no_dlcx_resp
 #MSC_Tests.TC_reset_two
 #MSC_Tests.TC_lu_and_mt_call
+#MSC_Tests.TC_cipher_complete_with_invalid_cipher