BSC_Tests: add testcases to verify S15-S0 handling

The handling of the AMR rate configuration bits S15-S0 is currently only
superficially checked. Lets add more some more elaborated testcases to
check through varios different situations. Also make sure that the
resulting mr configuration IE is verified

Change-Id: Ica323deb9836deea72982e093c9cb31deb5a216b
Related: SYS#4470
diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 0ea73a0..96797c9 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -426,6 +426,7 @@
 	integer		media_nr, /* determins MGCP EP, port numbers */
 	BSSMAP_IE_SpeechCodecList ass_codec_list optional,
 	RSL_IE_Body	expect_mr_conf_ie optional, /* typically present for AMR codecs */
+	bitstring	expect_mr_s0_s7 optional, /* typically present for AMR codecs */
 	TestHdlrEncrParams encr optional,
 	TestHdlrParamsLcls lcls,
 	TestHdlrParamsHandover handover optional,
@@ -443,6 +444,7 @@
 	media_nr := 1,
 	ass_codec_list := omit,
 	expect_mr_conf_ie := omit,
+	expect_mr_s0_s7 := omit,
 	encr := omit,
 	lcls := {
 		gcr := omit,