Add info about default values to describe

Change-Id: I9919e0d366b56ac17e7b606aa5aa0ae048b447c3
diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index f3fde9e..d01cb1d 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -121,6 +121,10 @@
         if (m_datastore.schema()->leafIsKey(path)) {
             ss << " (key)";
         }
+
+        if (auto defaultValue = m_datastore.schema()->defaultValue(path)) {
+            ss << " default: " << leafDataToString(*defaultValue);
+        }
         break;
     }
     case yang::NodeTypes::List: