REORG: listener: move the listening address to a struct receiver

The address will be specific to the receiver so let's move it there.
diff --git a/src/haproxy.c b/src/haproxy.c
index 0f72d5a..12a5992 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -719,11 +719,11 @@
 
 			list_for_each_entry(l, &bind_conf->listeners, by_bind) {
 
-				if (l->addr.ss_family == AF_UNIX &&
+				if (l->rx.addr.ss_family == AF_UNIX &&
 				    (bind_conf->level & ACCESS_FD_LISTENERS)) {
 					const struct sockaddr_un *un;
 
-					un = (struct sockaddr_un *)&l->addr;
+					un = (struct sockaddr_un *)&l->rx.addr;
 					/* priority to old_unixsocket */
 					if (!cur_unixsocket) {
 						cur_unixsocket = strdup(un->sun_path);