remove GRPC insecure config options, since it always needs to be set to insecure

ocs/pkg/service/v0/service.go

@@ -161,7 +161,7 @@ func (o Ocs) getAccountService() accounts.AccountsService {
 }
 
 func (o Ocs) getCS3Backend() backend.UserBackend {
-	revaClient, err := pool.GetGatewayServiceClient(o.config.Reva.Address) //TODO: insecure defaults to true, https://github.com/cs3org/reva/issues/2216
+	revaClient, err := pool.GetGatewayServiceClient(o.config.Reva.Address)
 	if err != nil {
 		o.logger.Fatal().Msgf("could not get reva client at address %s", o.config.Reva.Address)
 	}

ocs/pkg/service/v0/users.go

@@ -384,7 +384,7 @@ func (o Ocs) DeleteUser(w http.ResponseWriter, r *http.Request) {
 
 		ctx := metadata.AppendToOutgoingContext(r.Context(), revactx.TokenHeader, t)
 
-		gwc, err := pool.GetGatewayServiceClient(o.config.Reva.Address) //TODO: insecure defaults to true, https://github.com/cs3org/reva/issues/2216
+		gwc, err := pool.GetGatewayServiceClient(o.config.Reva.Address)
 		if err != nil {
 			o.logger.Error().Err(err).Msg("error securing a connection to Reva gateway")
 		}