bootstrap.sh: Remove git submodule init because we do not have any submodules any more.
bootstrap.sh: Remove git submodule init because we do not have any submodules any more.

I don't know when/if we had some in the past and when we got rid of them.

Signed-off-by: Michael Berlin <d0bd1c6a4289581537082d4e674f75efbec53916@google.com>

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