bsc: Create a osmo_bsc_data and embed osmo_msc_data

We want to have multiple MSCs but we also have some data
that is only present on a per BSC basis. Right now the
MSC data is not allocated with talloc, so we have some
change in the talloc contexts.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_filter.c b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
index d2735a6..fce38ce 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_filter.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
@@ -1,5 +1,5 @@
-/* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2009-2010 by On-Waves
+/* (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2011 by On-Waves
  * All Rights Reserved
  *
  * This program is free software; you can redistribute it and/or modify
@@ -125,10 +125,10 @@
 	struct gsm_network *net;
 	net = conn->bts->network;
 
-	if (!net->msc_data->ussd_welcome_txt)
+	if (!net->bsc_data->msc.ussd_welcome_txt)
 		return;
 
-	gsm0480_send_ussdNotify(conn, 1, net->msc_data->ussd_welcome_txt);
+	gsm0480_send_ussdNotify(conn, 1, net->bsc_data->msc.ussd_welcome_txt);
 	gsm0480_send_releaseComplete(conn);
 }
 
@@ -152,8 +152,8 @@
 	net = conn->bts->network;
 
 	if (mtype == GSM48_MT_MM_LOC_UPD_ACCEPT) {
-		if (net->msc_data->core_ncc != -1 ||
-		    net->msc_data->core_mcc != -1) {
+		if (net->bsc_data->msc.core_ncc != -1 ||
+		    net->bsc_data->msc.core_mcc != -1) {
 			if (msgb_l3len(msg) >= sizeof(*gh) + sizeof(*lai)) {
 				lai = (struct gsm48_loc_area_id *) &gh->data[0];
 				gsm48_generate_lai(lai, net->country_code,