vttest: unexport GetVars and make it a default for HealthCheck instead of an additional check
vttest: unexport GetVars and make it a default for HealthCheck instead of an additional check

Signed-off-by: Matt Harden <0b82c51c138a59f492ca83aa12e35bc82a735a2a@gmail.com>

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