Adding more get voltha apis

Change-Id: I4fe2696e3ffdcb1477e5d97d0405353ab465c062
diff --git a/experiments/netconf/proto2yang/ietf-meta.yang b/experiments/netconf/proto2yang/ietf-meta.yang
index 92a480a..05fff41 100644
--- a/experiments/netconf/proto2yang/ietf-meta.yang
+++ b/experiments/netconf/proto2yang/ietf-meta.yang
@@ -26,6 +26,9 @@
             enum READ_ONLY {
                 description "";
             }
+            enum REAL_TIME {
+                description "";
+            }
         }
         description
             "";