Adding more get voltha apis

Change-Id: I4fe2696e3ffdcb1477e5d97d0405353ab465c062
diff --git a/experiments/netconf/proto2yang/schema.proto b/experiments/netconf/proto2yang/schema.proto
index e75f696..1023f1a 100644
--- a/experiments/netconf/proto2yang/schema.proto
+++ b/experiments/netconf/proto2yang/schema.proto
@@ -21,6 +21,8 @@
     // Proto file name from which swagger.json shall be generated
     string swagger_from = 2;
 
+    // Proto file name from which yang schemas shall be generated
+    string yang_from = 3;
 }
 
 // Schema services