04.08: log protocol discriminators and message types by name

On incoming 04.08 messages, we log only the protocol discriminator in
decimal. Enhance: log pdisc and message type in hex, and also log the
protocol and message type as human readable string.

Also adjust the msc_vlr tests' log statements for wrapped rx/tx functions
of dtap from/to the MS.

Adjust the expected output of msc_vlr_tests.

Change-Id: Ida205d217e304337d816b14fd15e2ee435e7397d
Depends: libosmocore change-id I0fca8e95ed5c2148b1a7440eff3fc9c7583898df
diff --git a/tests/msc_vlr/msc_vlr_test_ms_timeout.err b/tests/msc_vlr/msc_vlr_test_ms_timeout.err
index 046548c..1574ef9 100644
--- a/tests/msc_vlr/msc_vlr_test_ms_timeout.err
+++ b/tests/msc_vlr/msc_vlr_test_ms_timeout.err
@@ -1,10 +1,10 @@
 ===== test_ms_timeout_lu_auth_resp
 - Total time passed: 0.000000 s
 - Location Update request causes a GSUP Send Auth Info request to HLR
-  rx from MS: pdisc=0x05 msg_type=0x08
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
 DREF unknown: MSC conn use + 1 == 1
-DRLL Dispatching 04.08 message, pdisc=5
+DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
 DREF unknown: MSC conn use + 1 == 2
 DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Allocated
 DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
@@ -103,10 +103,10 @@
 ===== test_ms_timeout_cm_auth_resp
 - Total time passed: 0.000000 s
 - Location Update request causes a GSUP Send Auth Info request to HLR
-  rx from MS: pdisc=0x05 msg_type=0x08
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_LOC_UPD_REQUEST
   new conn
 DREF unknown: MSC conn use + 1 == 1
-DRLL Dispatching 04.08 message, pdisc=5
+DRLL Dispatching 04.08 message GSM48_MT_MM_LOC_UPD_REQUEST (0x5:0x8)
 DREF unknown: MSC conn use + 1 == 2
 DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Allocated
 DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Received Event SUBSCR_CONN_E_START
@@ -149,9 +149,9 @@
   auth_request_sent == 1
   lu_result_sent == 0
 - MS sends Authen Response, VLR accepts and sends GSUP LU Req to HLR
-  rx from MS: pdisc=0x05 msg_type=0x54
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_AUTH_RESP
 DREF IMSI:901700000004620: MSC conn use + 1 == 2
-DRLL Dispatching 04.08 message, pdisc=5
+DRLL Dispatching 04.08 message GSM48_MT_MM_AUTH_RESP (0x5:0x14)
 DMM IMSI:901700000004620: MM GSM AUTHENTICATION RESPONSE (sres = 2d8b2c3e)
 DVLR VLR_Authenticate(901700000004620){VLR_SUB_AS_WAIT_RESP}: Received Event VLR_AUTH_E_MS_AUTH_RESP
 DVLR SUBSCR(IMSI:901700000004620) received res: 2d 8b 2c 3e 
@@ -246,10 +246,10 @@
   llist_count(&net->subscr_conns) == 0
 ---
 - after a while, a new conn sends a CM Service Request. VLR responds with Auth Req, 2nd auth vector
-  rx from MS: pdisc=0x05 msg_type=0x24
+  MSC <--RAN_GERAN_A-- MS: GSM48_MT_MM_CM_SERV_REQ
   new conn
 DREF unknown: MSC conn use + 1 == 1
-DRLL Dispatching 04.08 message, pdisc=5
+DRLL Dispatching 04.08 message GSM48_MT_MM_CM_SERV_REQ (0x5:0x24)
 DMM <- CM SERVICE REQUEST serv_type=0x08 MI(IMSI)=901700000004620
 DREF unknown: MSC conn use + 1 == 2
 DMM Subscr_Conn(901700000004620){SUBSCR_CONN_S_INIT}: Allocated