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/meta.proto b/protos/voltha_protos/meta.proto
index d359df1..2eaee4d 100644
--- a/protos/voltha_protos/meta.proto
+++ b/protos/voltha_protos/meta.proto
@@ -17,7 +17,8 @@
 
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v2/go/common";
+option go_package = "github.com/opencord/voltha-protos/v3/go/common";
+option java_package = "org.opencord.voltha.common";
 
 package voltha;