bootstrap.sh: Remove special handling for go get of cover binary for older binaries.
bootstrap.sh: Remove special handling for go get of cover binary for older binaries.

I suspect that it's not really necessary anymore.
ptomasroos/vitess,cloudbearings/vitess,aaijazi/vitess,davygeek/vitess,mlc0202/vitess,mapbased/vitess,tirsen/vitess,AndyDiamondstein/vitess,mattharden/vitess,xgwubin/vitess,fengshao0907/vitess,applift/vitess,xgwubin/vitess,pivanof/vitess,yaoshengzhe/vitess,aaijazi/vitess,sougou/vitess,mahak/vitess,sougou/vitess,mlc0202/vitess,xgwubin/vitess,guokeno0/vitess,kmiku7/vitess-annotated,yaoshengzhe/vitess,mapbased/vitess,fengshao0907/vitess,erzel/vitess,erzel/vitess,sougou/vitess,vitessio/vitess,tjyang/vitess,AndyDiamondstein/vitess,HubSpot/vitess,kuipertan/vitess,atyenoria/vitess,ptomasroos/vitess,dumbunny/vitess,tinyspeck/vitess,cloudbearings/vitess,HubSpot/vitess,tjyang/vitess,fengshao0907/vitess,nurblieh/vitess,kuipertan/vitess,mapbased/vitess,yangzhongj/vitess,AndyDiamondstein/vitess,mahak/vitess,alainjobart/vitess,pivanof/vitess,HubSpot/vitess,erzel/vitess,nurblieh/vitess,kmiku7/vitess-annotated,anusornc/vitess,guokeno0/vitess,cloudbearings/vitess,kmiku7/vitess-annotated,tinyspeck/vitess,mahak/vitess,cgvarela/vitess,nurblieh/vitess,vitessio/vitess,xgwubin/vitess,alainjobart/vitess,dumbunny/vitess,kuipertan/vitess,tinyspeck/vitess,vitessio/vitess,applift/vitess,fengshao0907/vitess,mapbased/vitess,cgvarela/vitess,atyenoria/vitess,michael-berlin/vitess,skyportsystems/vitess,AndyDiamondstein/vitess,nurblieh/vitess,ptomasroos/vitess,dumbunny/vitess,cgvarela/vitess,enisoc/vitess,tirsen/vitess,anusornc/vitess,tinyspeck/vitess,michael-berlin/vitess,anusornc/vitess,rnavarro/vitess,vitessio/vitess,applift/vitess,tirsen/vitess,mapbased/vitess,dcadevil/vitess,dcadevil/vitess,mapbased/vitess,mlc0202/vitess,dcadevil/vitess,sougou/vitess,aaijazi/vitess,alainjobart/vitess,enisoc/vitess,tirsen/vitess,guokeno0/vitess,vitessio/vitess,mlc0202/vitess,mattharden/vitess,enisoc/vitess,aaijazi/vitess,aaijazi/vitess,yaoshengzhe/vitess,rnavarro/vitess,vitessio/vitess,yangzhongj/vitess,fengshao0907/vitess,sougou/vitess,erzel/vitess,tinyspeck/vitess,enisoc/vitess,mahak/vitess,cgvarela/vitess,HubSpot/vitess,erzel/vitess,tjyang/vitess,yaoshengzhe/vitess,kmiku7/vitess-annotated,kmiku7/vitess-annotated,mlc0202/vitess,kuipertan/vitess,skyportsystems/vitess,atyenoria/vitess,cloudbearings/vitess,kmiku7/vitess-annotated,cloudbearings/vitess,dcadevil/vitess,HubSpot/vitess,mapbased/vitess,erzel/vitess,alainjobart/vitess,yangzhongj/vitess,mattharden/vitess,atyenoria/vitess,tjyang/vitess,yaoshengzhe/vitess,nurblieh/vitess,guokeno0/vitess,rnavarro/vitess,mahak/vitess,guokeno0/vitess,AndyDiamondstein/vitess,michael-berlin/vitess,mlc0202/vitess,cgvarela/vitess,vitessio/vitess,yangzhongj/vitess,xgwubin/vitess,anusornc/vitess,cloudbearings/vitess,xgwubin/vitess,yangzhongj/vitess,mattharden/vitess,tjyang/vitess,rnavarro/vitess,sougou/vitess,atyenoria/vitess,rnavarro/vitess,tirsen/vitess,nurblieh/vitess,skyportsystems/vitess,fengshao0907/vitess,HubSpot/vitess,applift/vitess,alainjobart/vitess,applift/vitess,pivanof/vitess,mattharden/vitess,michael-berlin/vitess,kuipertan/vitess,ptomasroos/vitess,davygeek/vitess,sougou/vitess,mattharden/vitess,xgwubin/vitess,mapbased/vitess,michael-berlin/vitess,dumbunny/vitess,davygeek/vitess,ptomasroos/vitess,dumbunny/vitess,dumbunny/vitess,atyenoria/vitess,applift/vitess,tirsen/vitess,michael-berlin/vitess,erzel/vitess,mattharden/vitess,kuipertan/vitess,rnavarro/vitess,erzel/vitess,skyportsystems/vitess,guokeno0/vitess,tirsen/vitess,rnavarro/vitess,tinyspeck/vitess,kuipertan/vitess,atyenoria/vitess,pivanof/vitess,tirsen/vitess,dumbunny/vitess,skyportsystems/vitess,cgvarela/vitess,dcadevil/vitess,anusornc/vitess,pivanof/vitess,ptomasroos/vitess,skyportsystems/vitess,yaoshengzhe/vitess,pivanof/vitess,alainjobart/vitess,dcadevil/vitess,tinyspeck/vitess,ptomasroos/vitess,mattharden/vitess,fengshao0907/vitess,pivanof/vitess,anusornc/vitess,cloudbearings/vitess,yaoshengzhe/vitess,mlc0202/vitess,fengshao0907/vitess,enisoc/vitess,kmiku7/vitess-annotated,cloudbearings/vitess,mlc0202/vitess,AndyDiamondstein/vitess,cgvarela/vitess,applift/vitess,tjyang/vitess,rnavarro/vitess,cgvarela/vitess,erzel/vitess,aaijazi/vitess,enisoc/vitess,pivanof/vitess,applift/vitess,tjyang/vitess,atyenoria/vitess,sougou/vitess,tjyang/vitess,yangzhongj/vitess,yangzhongj/vitess,ptomasroos/vitess,michael-berlin/vitess,atyenoria/vitess,yaoshengzhe/vitess,skyportsystems/vitess,michael-berlin/vitess,yangzhongj/vitess,mahak/vitess,skyportsystems/vitess,mattharden/vitess,tirsen/vitess,aaijazi/vitess,mattharden/vitess,vitessio/vitess,rnavarro/vitess,nurblieh/vitess,ptomasroos/vitess,yaoshengzhe/vitess,cloudbearings/vitess,dumbunny/vitess,guokeno0/vitess,aaijazi/vitess,fengshao0907/vitess,AndyDiamondstein/vitess,davygeek/vitess,davygeek/vitess,dumbunny/vitess,dcadevil/vitess,nurblieh/vitess,nurblieh/vitess,kuipertan/vitess,HubSpot/vitess,michael-berlin/vitess,xgwubin/vitess,HubSpot/vitess,yangzhongj/vitess,skyportsystems/vitess,AndyDiamondstein/vitess,kuipertan/vitess,anusornc/vitess,xgwubin/vitess,erzel/vitess,applift/vitess,anusornc/vitess,applift/vitess,anusor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