VTY: install talloc context introspection commands

Change-Id: I2e1e26be1162b0fb695969e5ac265704adaf9d5c
diff --git a/src/pcu_main.cpp b/src/pcu_main.cpp
index 9b1319c..a33b655 100644
--- a/src/pcu_main.cpp
+++ b/src/pcu_main.cpp
@@ -269,6 +269,7 @@
 	gprs_ns_set_log_ss(DNS);
 	bssgp_set_log_ss(DBSSGP);
 
+	pcu_vty_info.tall_ctx = tall_pcu_ctx;
 	vty_init(&pcu_vty_info);
 	pcu_vty_init();