MSC_ConnectionHandler: more verbosity for f_check_mgcp_expectations()

The function f_check_mgcp_expectations() checks the counters that
count the occurrence of MDCX and CRCX messages against computed
expected values. At the moment it is not easy to spot where exactly
the deviation occurred. Lets add some log output so that we can see
which type of message on which connection was missing or too much.
Also add a string parameter that is set to the calling functions
name so that we know from where the check has been triggered.

- Add more verbose log output for counters
- Add parameter to prepend to the log line

Change-Id: Ida0eba4ef3c1db977d392267ef76ec37b87133b3
Related: OS#3292

bsc/MSC_ConnectionHandler.ttcn

@@ -796,6 +796,10 @@ function f_ass_patch_lcls(inout template (omit) PDU_BSSAP ass_tpl,
  * expected */
 function f_check_mgcp_expectations() runs on MSC_ConnHdlr {
 	for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) {
+		log(testcasename(), ": Check MGCP test expectations for g_media.mgcp_conn[", i , "]:",
+		    " crcx_seen=", g_media.mgcp_conn[i].crcx_seen, ", crcx_seen_exp=", g_media.mgcp_conn[i].crcx_seen_exp,
+		    ", mdcx_seen=", g_media.mgcp_conn[i].mdcx_seen, ", mdcx_seen_exp=", g_media.mgcp_conn[i].mdcx_seen_exp);
+
 		if(g_media.mgcp_conn[i].crcx_seen != g_media.mgcp_conn[i].crcx_seen_exp) {
 			setverdict(fail, "unexpected number of MGW-CRCX transactions");
 		}