!store-imei: report IMEI in the log without requiring a subscriber

When store-imei is configured, a subscriber record is expected to exist
for receiving that IMEI storage - this mode is expected to be used
together with subscriber-create-on-demand.  However, what about
operation without store-imei?  Standard OsmoHLR still requires a
subscriber record to be present, even though the IMEI is only
emitted into log output.  Change this aspect, and also change the
log message format to make it friendlier to tools that will extract
IMSI-IMEI correspondence pairs from syslog.

Change-Id: If1fae788e943c6ffdb632751899ab5d3286b3428

src/hlr.c

@@ -420,13 +420,9 @@ static int rx_check_imei_req(struct osmo_gsup_req *req)
 			return -1;
 		}
 	} else {
-		/* Check if subscriber exists and print IMEI */
-		LOGP(DMAIN, LOGL_INFO, "IMSI='%s': has IMEI = %s (consider setting 'store-imei')\n", gsup->imsi, imei);
-		struct hlr_subscriber subscr;
-		if (db_subscr_get_by_imsi(g_hlr->dbc, gsup->imsi, &subscr) < 0) {
-			osmo_gsup_req_respond_err(req, GMM_CAUSE_INV_MAND_INFO, "IMSI unknown");
-			return -1;
-		}
+		/* ThemWi change: report IMSI-IMEI correspondence in syslog */
+		LOGP(DMAIN, LOGL_NOTICE, "IMEI REPORT: IMSI=%s has IMEI=%s\n",
+			gsup->imsi, imei);
 	}
 
 	/* Accept all IMEIs */

src/hlr_ussd.c

@@ -386,7 +386,7 @@ static int handle_ussd_own_msisdn(struct ss_session *ss,
 		if (strlen(subscr.msisdn) == 0)
 			snprintf(buf, sizeof(buf), "You have no MSISDN!");
 		else
-			snprintf(buf, sizeof(buf), "Your extension is %s", subscr.msisdn);
+			snprintf(buf, sizeof(buf), "Your phone number is %s", subscr.msisdn);
 		ss_tx_to_ms_ussd_7bit(ss, req->invoke_id, buf);
 		break;
 	case -ENOENT: