osmo-hlr: Add talloc context introspection via VTY

This requires libosmocore with Change-Id
I43fc42880b22294d83c565ae600ac65e4f38b30d or later.

Change-Id: Ibc2c333b83f85fa69a364e3e342f12f50dbc2f70
diff --git a/tests/test_nodes.vty b/tests/test_nodes.vty
index 69472e6..5afa144 100644
--- a/tests/test_nodes.vty
+++ b/tests/test_nodes.vty
@@ -13,6 +13,9 @@
 ...
   show logging vty
   show alarms
+  show talloc-context (application|all) (full|brief|DEPTH)
+  show talloc-context (application|all) (full|brief|DEPTH) tree ADDRESS
+  show talloc-context (application|all) (full|brief|DEPTH) filter REGEXP
   subscriber (imsi|msisdn|id) IDENT show
 
 OsmoHLR> enable