rename some RAN conn related stuff to ran_conn_*

Following previous rename of gsm_subscriber_connection:

Some functions and #defines are still called like "msc_conn" or just "msc_",
while they are clearly about a RAN conn.

To avoid confusion with the future separate concepts of MSC roles and a RAN
connection, rename all those to match the common "ran_conn" prefix.

Change-Id: Ia17a0a35f11911e00e19cafb5d7828d729a69640
diff --git a/src/libmsc/gsm_09_11.c b/src/libmsc/gsm_09_11.c
index e1ea681..c0a0bdd 100644
--- a/src/libmsc/gsm_09_11.c
+++ b/src/libmsc/gsm_09_11.c
@@ -113,7 +113,7 @@
 		/* Count active NC SS/USSD sessions */
 		osmo_counter_inc(conn->network->active_nc_ss);
 
-		trans->conn = ran_conn_get(conn, MSC_CONN_USE_TRANS_NC_SS);
+		trans->conn = ran_conn_get(conn, RAN_CONN_USE_TRANS_NC_SS);
 		trans->dlci = OMSC_LINKID_CB(msg);
 		cm_service_request_concludes(conn, msg);
 	}
@@ -232,7 +232,7 @@
 			vlr_subscr_msisdn_or_name(transt->vsub));
 
 		/* Assign connection */
-		transt->conn = ran_conn_get(conn, MSC_CONN_USE_TRANS_NC_SS);
+		transt->conn = ran_conn_get(conn, RAN_CONN_USE_TRANS_NC_SS);
 		transt->paging_request = NULL;
 
 		/* Send stored message */
@@ -324,7 +324,7 @@
 	conn = connection_for_subscr(vsub);
 	if (conn) {
 		/* Assign connection */
-		trans->conn = ran_conn_get(conn, MSC_CONN_USE_TRANS_NC_SS);
+		trans->conn = ran_conn_get(conn, RAN_CONN_USE_TRANS_NC_SS);
 		trans->dlci = 0x00; /* SAPI=0, not SACCH */
 		return trans;
 	}