Add more types to YangSchema::nodeType

This doesn't do much here (we can't parse paths to these new types, so
no way to call it with that a path of a new type), but it will be useful
with the new approach to node parsing, where nodeType is used.

Change-Id: If7aefca145094f305752a192bfaa3ea658f32081
diff --git a/src/schema.hpp b/src/schema.hpp
index 052386e..f11265f 100644
--- a/src/schema.hpp
+++ b/src/schema.hpp
@@ -22,7 +22,12 @@
     Container,
     PresenceContainer,
     List,
-    Leaf
+    Leaf,
+    Rpc,
+    Action,
+    Notification,
+    AnyXml,
+    LeafList
 };
 
 enum class Status {