Don't retry if topo server can't resolve in the vtgate

Signed-off-by: Matt Lord <[email protected]>

go/vt/vtgate/vstream_manager.go

@@ -170,7 +170,7 @@ func (vsm *vstreamManager) VStream(ctx context.Context, tabletType topodatapb.Ta
 	}
 	if ts == nil {
 		log.Errorf("unable to get topo server in VStream()")
-		return vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "unable to get topoology server")
+		return vterrors.Errorf(vtrpcpb.Code_ABORTED, "unable to get topoology server")
 	}
 	vs := &vstream{
 		vgtid:                       vgtid,