Support configuration of CON MO Groups/Paths from VTY

The code for supporting the configuration of the OM2000 CON (LAPD
Concentrator) MO was so far incomplete and not used from the OM2000 FSM
initialization.  This patch adds
* VTY commands for configuration of CON Groups and Paths
* The FSM integration to actually configure the CON MO

Change-Id: I56dc1b5e35adef3a2078bcf9536537eb0f454192
diff --git a/openbsc/src/libcommon/common_vty.c b/openbsc/src/libcommon/common_vty.c
index a0674f0..834da51 100644
--- a/openbsc/src/libcommon/common_vty.c
+++ b/openbsc/src/libcommon/common_vty.c
@@ -28,6 +28,7 @@
 #include <openbsc/debug.h>
 #include <openbsc/gsm_subscriber.h>
 #include <openbsc/bsc_nat.h>
+#include <openbsc/abis_om2000.h>
 
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/command.h>
@@ -79,6 +80,15 @@
 		talloc_free(vty->index);
 		vty->index = NULL;
 		break;
+	case OM2K_CON_GROUP_NODE:
+		vty->node = BTS_NODE;
+		{
+			struct con_group *cg = vty->index;
+			struct gsm_bts *bts = cg->bts;
+			vty->index = bts;
+			vty->index_sub = &bts->description;
+		}
+		break;
 	case NAT_BSC_NODE:
 		vty->node = NAT_NODE;
 		{