Merge pull request #5928 from xiang90/err_code

rpctypes: use permission deny code for permission deny error

etcdserver/api/v3rpc/rpctypes/error.go

@@ -45,7 +45,7 @@ var (
 	ErrGRPCRoleAlreadyExist     = grpc.Errorf(codes.FailedPrecondition, "etcdserver: role name already exists")
 	ErrGRPCRoleNotFound         = grpc.Errorf(codes.FailedPrecondition, "etcdserver: role name not found")
 	ErrGRPCAuthFailed           = grpc.Errorf(codes.InvalidArgument, "etcdserver: authentication failed, invalid user ID or password")
-	ErrGRPCPermissionDenied     = grpc.Errorf(codes.FailedPrecondition, "etcdserver: permission denied")
+	ErrGRPCPermissionDenied     = grpc.Errorf(codes.PermissionDenied, "etcdserver: permission denied")
 	ErrGRPCRoleNotGranted       = grpc.Errorf(codes.FailedPrecondition, "etcdserver: role is not granted to the user")
 	ErrGRPCPermissionNotGranted = grpc.Errorf(codes.FailedPrecondition, "etcdserver: permission is not granted to the role")
 	ErrGRPCAuthNotEnabled       = grpc.Errorf(codes.FailedPrecondition, "etcdserver: authentication is not enabled")