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/src/libmgcp/Makefile.am b/src/libmgcp/Makefile.am
index 5faf602..5d7844d 100644
--- a/src/libmgcp/Makefile.am
+++ b/src/libmgcp/Makefile.am
@@ -30,11 +30,14 @@
 	$(NULL)
 
 libmgcp_a_SOURCES = \
+	mgcp_common.c \
 	mgcp_protocol.c \
 	mgcp_network.c \
 	mgcp_vty.c \
 	mgcp_osmux.c \
 	mgcp_sdp.c \
+	mgcpgw_client.c \
+	mgcpgw_client_vty.c \
 	$(NULL)
 if BUILD_MGCP_TRANSCODING
 libmgcp_a_SOURCES += \