add three tests for CIPHER MODE COMPLETE without algo

Add three tests which exercise MSC behaviour when a CIPHER MODE
COMPLETE command lacks the optional chosenEncryptionAlgorithm IE.
Check for behaviour with A5/1, A5/3, and A5/1 + A5/3 configured
in the network, and expect the location update to succeed.

These tests pass on master, but they should somehow verify the
cipher the MSC ends up using. I am not quite sure how to do that.
Would inspecting the MSC's VTY be a reasonable approach? How
could his be done by code which runs on BSC_ConnectionHandler?

Change-Id: I1a2a126795c544613a7a87e238e1fc8c4e943885
Related: OS#2872
diff --git a/msc/MSC_Tests.cfg b/msc/MSC_Tests.cfg
index b412889..b852bac 100644
--- a/msc/MSC_Tests.cfg
+++ b/msc/MSC_Tests.cfg
@@ -61,3 +61,6 @@
 #MSC_Tests.TC_reset_two
 #MSC_Tests.TC_lu_and_mt_call
 #MSC_Tests.TC_cipher_complete_with_invalid_cipher
+#MSC_Tests.TC_cipher_complete_1_without_cipher
+#MSC_Tests.TC_cipher_complete_3_without_cipher
+#MSC_Tests.TC_cipher_complete_13_without_cipher