VOL-1643 Unsuitable attribute names are renamed for gRPC Java support

- proto files are modified to support compilation of generated Java code
- schema.proto and yang_options.proto files are deleted since there is no need for netconf in Voltha.
Change-Id: I6d8796d74a284529e5bc5926762e77ceaa31638b
diff --git a/protos/voltha_protos/ponsim.proto b/protos/voltha_protos/ponsim.proto
index f56290f..202ccdb 100644
--- a/protos/voltha_protos/ponsim.proto
+++ b/protos/voltha_protos/ponsim.proto
@@ -1,6 +1,7 @@
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v2/go/voltha";
+option go_package = "github.com/opencord/voltha-protos/v3/go/voltha";
+option java_package = "org.opencord.voltha";
 
 package voltha;