vty: move struct vty_parent_node to private API

Change-Id: Id2070f03b09feea966c5342361d409551e557d38
diff --git a/TODO-RELEASE b/TODO-RELEASE
index 2935a81..bade6f5 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -8,4 +8,5 @@
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what			description / commit summary line
 libosmogsm  new header osmocom/gsm/protocol/gsm_44_060.h
-libosmocore ADD     new defines in osmocom/gsm/protocol/gsm_04_08.h (old ones marked deprecated)
\ No newline at end of file
+libosmocore ADD     new defines in osmocom/gsm/protocol/gsm_04_08.h (old ones marked deprecated)
+libosmovty	drop API		drop struct vty_parent_node from public API, it should never have been public