Implement IuCS (large refactoring and addition)

osmo-nitb becomes osmo-msc
add DIUCS debug log constant
add iucs.[hc]
add msc vty, remove nitb vty
add libiudummy, to avoid linking Iu deps in tests
Use new msc_tx_dtap() instead of gsm0808_submit_dtap()
libmgcp: add mgcpgw client API
bridge calls via mgcpgw

Enable MSC specific CTRL commands, bsc_base_ctrl_cmds_install() still needs to
be split up.

Change-Id: I5b5b6a9678b458affa86800afb1ec726e66eed88
diff --git a/include/openbsc/vty.h b/include/openbsc/vty.h
index 0cb0eec..f705601 100644
--- a/include/openbsc/vty.h
+++ b/include/openbsc/vty.h
@@ -47,6 +47,8 @@
 int bsc_vty_init(struct gsm_network *network);
 int bsc_vty_init_extra(void);
 
+void msc_vty_init(struct gsm_network *msc_network);
+
 struct gsm_network *gsmnet_from_vty(struct vty *vty);
 
 #endif