vtworker: Restore old format string to stay consistent.
vtworker: Restore old format string to stay consistent.

This was changed in: https://github.com/youtube/vitess/pull/2968
alainjobart/vitess,alainjobart/vitess,tirsen/vitess,HubSpot/vitess,tirsen/vitess,tinyspeck/vitess,HubSpot/vitess,vitessio/vitess,tirsen/vitess,tinyspeck/vitess,mattharden/vitess,alainjobart/vitess,enisoc/vitess,mattharden/vitess,HubSpot/vitess,tinyspeck/vitess,HubSpot/vitess,dcadevil/vitess,HubSpot/vitess,davygeek/vitess,vitessio/vitess,sougou/vitess,tinyspeck/vitess,enisoc/vitess,dcadevil/vitess,sougou/vitess,davygeek/vitess,alainjobart/vitess,tirsen/vitess,vitessio/vitess,mahak/vitess,tirsen/vitess,alainjobart/vitess,tinyspeck/vitess,dcadevil/vitess,davygeek/vitess,tinyspeck/vitess,sougou/vitess,sougou/vitess,dcadevil/vitess,mahak/vitess,enisoc/vitess,mattharden/vitess,HubSpot/vitess,alainjobart/vitess,tirsen/vitess,vitessio/vitess,enisoc/vitess,mahak/vitess,tirsen/vitess,davygeek/vitess,sougou/vitess,tirsen/vitess,alainjobart/vitess,mattharden/vitess,vitessio/vitess,mattharden/vitess,davygeek/vitess,mattharden/vitess,enisoc/vitess,dcadevil/vitess,vitessio/vitess,sougou/vitess,mattharden/vitess,sougou/vitess,mahak/vitess,vitessio/vitess,dcadevil/vitess,tirsen/vitess,tinyspeck/vitess,enisoc/vitess,HubSpot/vitess,mattharden/vitess,mattharden/vitess,dcadevil/vitess,vitessio/vitess,mattharden/vitess,sougou/vitess,davygeek/vitess,HubSpot/vitess,alainjobart/vitess,mahak/vitess,mahak/vitess,enisoc/vitess,davygeek/vitess,mahak/vitess,mahak/vitess