Move ng_socket and ng_btsocket initialization to SI_SUB_PROTO_DOMAIN as they

call net_add_domain(). Calling this function too early (or late) breaks
assertations about the global domains list.
Actually it should be forbidden to call net_add_domain() outside of
SI_SUB_PROTO_DOMAIN completely as there are many places where we traverse
the domains list unprotected, but for now we allow late calls (mostly to
support netgraph). In order to really fix this we have to lock the domains
list in all places or find another way to ensure that we can safely walk the
list while another thread might be adding a new domain.

Spotted by:	se
Reviewed by:	julian, glebius
PR:		kern/73321	(partly)

sys/netgraph/bluetooth/socket/ng_btsocket.c

@@ -234,7 +234,8 @@ static moduledata_t	ng_btsocket_mod = {
 	NULL
 };
 
-DECLARE_MODULE(ng_btsocket, ng_btsocket_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+DECLARE_MODULE(ng_btsocket, ng_btsocket_mod, SI_SUB_PROTO_DOMAIN,
+	SI_ORDER_ANY);
 MODULE_VERSION(ng_btsocket, NG_BLUETOOTH_VERSION);
 MODULE_DEPEND(ng_btsocket, ng_bluetooth, NG_BLUETOOTH_VERSION,
 	NG_BLUETOOTH_VERSION, NG_BLUETOOTH_VERSION);

sys/netgraph/ng_socket.c

@@ -143,7 +143,7 @@ static struct ng_type typestruct = {
 	.rcvdata =	ngs_rcvdata,
 	.disconnect =	ngs_disconnect,
 };
-NETGRAPH_INIT(socket, &typestruct);
+NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
 
 /* Buffer space */
 static u_long ngpdg_sendspace = 20 * 1024;	/* really max datagram size */