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/configure.ac b/configure.ac
index e1c3303..f184e78 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,7 +62,7 @@
 AM_CONDITIONAL(BUILD_BSC, test "x$osmo_ac_build_bsc" = "xyes")
 AC_SUBST(osmo_ac_build_bsc)
 
-# Enable/disable smpp support in the nitb?
+# Enable/disable smpp support in the msc?
 AC_ARG_ENABLE([smpp], [AS_HELP_STRING([--enable-smpp], [Build the SMPP interface])],
     [osmo_ac_build_smpp="$enableval"],[osmo_ac_build_smpp="no"])
 if test "$osmo_ac_build_smpp" = "yes" ; then
@@ -231,7 +231,7 @@
     src/libfilter/Makefile
     src/libiu/Makefile
     src/libcommon-cs/Makefile
-    src/osmo-nitb/Makefile
+    src/osmo-msc/Makefile
     src/osmo-bsc/Makefile
     src/osmo-bsc_nat/Makefile
     src/osmo-bsc_mgcp/Makefile