fix query pool timeout test to be more robust
fix query pool timeout test to be more robust

Signed-off-by: Michael Demmer <4b836671cce77b1b2fbe63e5b2a1661879d8af44@slack-corp.com>

davygeek/vitess,mattharden/vitess,mahak/vitess,tirsen/vitess,davygeek/vitess,tirsen/vitess,HubSpot/vitess,mattharden/vitess,davygeek/vitess,alainjobart/vitess,vitessio/vitess,tinyspeck/vitess,mattharden/vitess,alainjobart/vitess,HubSpot/vitess,tinyspeck/vitess,tirsen/vitess,alainjobart/vitess,dcadevil/vitess,enisoc/vitess,vitessio/vitess,enisoc/vitess,davygeek/vitess,HubSpot/vitess,enisoc/vitess,HubSpot/vitess,alainjobart/vitess,mattharden/vitess,enisoc/vitess,HubSpot/vitess,davygeek/vitess,tirsen/vitess,mahak/vitess,HubSpot/vitess,dcadevil/vitess,dcadevil/vitess,mattharden/vitess,tirsen/vitess,HubSpot/vitess,tinyspeck/vitess,enisoc/vitess,tinyspeck/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,davygeek/vitess,mattharden/vitess,tinyspeck/vitess,alainjobart/vitess,mahak/vitess,alainjobart/vitess,HubSpot/vitess,mattharden/vitess,mahak/vitess,dcadevil/vitess,davygeek/vitess,dcadevil/vitess,dcadevil/vitess,tirsen/vitess,vitessio/vitess,alainjobart/vitess,tinyspeck/vitess,mattharden/vitess,mattharden/vitess,vitessio/vitess,tirsen/vitess,vitessio/vitess,vitessio/vitess,mattharden/vitess,enisoc/vitess,tinyspeck/vitess,alainjobart/vitess,tirsen/vitess,enisoc/vitess,vitessio/vitess,dcadevil/vitess,tirsen/vitess,mahak/vitess