Adding more get voltha apis

Change-Id: I4fe2696e3ffdcb1477e5d97d0405353ab465c062
diff --git a/experiments/netconf/proto2yang/device.proto b/experiments/netconf/proto2yang/device.proto
index ac0f7e7..4fc261f 100644
--- a/experiments/netconf/proto2yang/device.proto
+++ b/experiments/netconf/proto2yang/device.proto
@@ -110,7 +110,7 @@
         // ("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx")
         string ipv6_address = 15;
 
-        ProxyAddress proxy_device = 19;
+        ProxyAddress proxy_address = 19;
     };
 
     AdminState admin_state = 16;