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/tests/db/Makefile.am b/tests/db/Makefile.am
index df421d8..bcb66ec 100644
--- a/tests/db/Makefile.am
+++ b/tests/db/Makefile.am
@@ -36,6 +36,7 @@
 	$(top_builddir)/src/libcommon-cs/libcommon-cs.a \
 	$(top_builddir)/src/libtrau/libtrau.a \
 	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/tests/libiudummy/libiudummy.a \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOGSM_LIBS) \