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/VERSION b/VERSION
index eca07e4..4a36342 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.2
+3.0.0