bootstrap.sh: check being called from the right directory
bootstrap.sh: check being called from the right directory

* Fix the check that bootstrap.sh is called from the current
  directory. While the existing check works it does not actually check
  what it says it is checking.

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