osmo_{client,server}_main: Remove is_config_node in vty_app_info

This member is deprcated/unused so simply remove it:

> 'is_config_node' is deprecated: Implicit parent node tracking has
> replaced the use of this callback. This callback is no longer called,
> ever, and can be left NULL.

Change-Id: I34295950557d9009b0d8d3378deb3b1263476f82

src/osmo_client_main.c

@@ -79,7 +79,6 @@ static struct vty_app_info vty_info = {
 	.name		= "OsmoPCAPClient",
 	.version	= PACKAGE_VERSION,
 	.go_parent_cb	= osmopcap_go_parent,
-	.is_config_node	= osmopcap_is_config_node,
 };
 
 static void print_usage()

src/osmo_common.c

@@ -88,13 +88,3 @@ int osmopcap_go_parent(struct vty *vty)
 
 	return vty->node;	
 }
-
-int osmopcap_is_config_node(struct vty *vty, int node)
-{
-	switch (node) {
-	case CONFIG_NODE:
-		return 0;
-	default:
-		return 1;
-	}
-}

src/osmo_server_main.c

@@ -89,7 +89,6 @@ static struct vty_app_info vty_info = {
 	.name		= "OsmoPCAPServer",
 	.version	= PACKAGE_VERSION,
 	.go_parent_cb	= osmopcap_go_parent,
-	.is_config_node	= osmopcap_is_config_node,
 };
 
 static void print_usage()