HO: cfg: tweak vty write

Have expicitly named vty write functions for bts and net levels, so that it is
trivial to add commands that exist only on one of each (like the upcoming
congestion check timer config for hodec2).

Change-Id: Ibea4c20abc50c3d655f6bbb1a643477dfc722c8e
diff --git a/include/osmocom/bsc/handover_vty.h b/include/osmocom/bsc/handover_vty.h
index 48af136..6ad5276 100644
--- a/include/osmocom/bsc/handover_vty.h
+++ b/include/osmocom/bsc/handover_vty.h
@@ -4,4 +4,5 @@
 #include <osmocom/bsc/handover_cfg.h>
 
 void ho_vty_init();
-void ho_vty_write(struct vty *vty, const char *indent, struct handover_cfg *ho);
+void ho_vty_write_net(struct vty *vty, struct gsm_network *net);
+void ho_vty_write_bts(struct vty *vty, struct gsm_bts *bts);