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/openolt.proto b/protos/voltha_protos/openolt.proto
index 0376849..7e51b8e 100644
--- a/protos/voltha_protos/openolt.proto
+++ b/protos/voltha_protos/openolt.proto
@@ -14,7 +14,9 @@
 
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v2/go/openolt";
+option go_package = "github.com/opencord/voltha-protos/v3/go/openolt";
+option java_package = "org.opencord.voltha.openolt";
+option java_outer_classname = "VolthaOpenOLT";
 
 package openolt;
 import "google/api/annotations.proto";