Adding test for plain csv reader.
Adding test for plain csv reader.

vitessio/vitess,applift/vitess,netroby/vitess,ptomasroos/vitess,vitessio/vitess,sougou/vitess,michael-berlin/vitess,skyportsystems/vitess,mapbased/vitess,rnavarro/vitess,kmiku7/vitess-annotated,anusornc/vitess,davygeek/vitess,AndyDiamondstein/vitess,pivanof/vitess,HubSpot/vitess,aaijazi/vitess,kuipertan/vitess,tinyspeck/vitess,skyportsystems/vitess,enisoc/vitess,mahak/vitess,mlc0202/vitess,tinyspeck/vitess,rnavarro/vitess,cgvarela/vitess,cloudbearings/vitess,tjyang/vitess,xgwubin/vitess,HubSpot/vitess,ptomasroos/vitess,applift/vitess,mattharden/vitess,fengshao0907/vitess,xgwubin/vitess,nurblieh/vitess,yaoshengzhe/vitess,aaijazi/vitess,HubSpot/vitess,AndyDiamondstein/vitess,mattharden/vitess,michael-berlin/vitess,erzel/vitess,tirsen/vitess,cgvarela/vitess,mlc0202/vitess,michael-berlin/vitess,pivanof/vitess,xgwubin/vitess,apmichaud/vitess-apm,HubSpot/vitess,kuipertan/vitess,enisoc/vitess,sougou/vitess,alainjobart/vitess,tirsen/vitess,netroby/vitess,alainjobart/vitess,kuipertan/vitess,applift/vitess,tirsen/vitess,michael-berlin/vitess,tinyspeck/vitess,apmichaud/vitess-apm,michael-berlin/vitess,netroby/vitess,apmichaud/vitess-apm,vitessio/vitess,kmiku7/vitess-annotated,AndyDiamondstein/vitess,nurblieh/vitess,atyenoria/vitess,SDHM/vitess,aaijazi/vitess,sougou/vitess,vitessio/vitess,guokeno0/vitess,dumbunny/vitess,atyenoria/vitess,vitessio/vitess,davygeek/vitess,nurblieh/vitess,nurblieh/vitess,SDHM/vitess,yangzhongj/vitess,mahak/vitess,SDHM/vitess,applift/vitess,guokeno0/vitess,fengshao0907/vitess,applift/vitess,xgwubin/vitess,mattharden/vitess,erzel/vitess,tirsen/vitess,mlc0202/vitess,dcadevil/vitess,cloudbearings/vitess,yangzhongj/vitess,tjyang/vitess,enisoc/vitess,yangzhongj/vitess,AndyDiamondstein/vitess,anusornc/vitess,yaoshengzhe/vitess,anusornc/vitess,yangzhongj/vitess,cloudbearings/vitess,ptomasroos/vitess,mapbased/vitess,michael-berlin/vitess,fengshao0907/vitess,skyportsystems/vitess,guokeno0/vitess,erzel/vitess,sougou/vitess,erzel/vitess,fengshao0907/vitess,applift/vitess,dcadevil/vitess,anusornc/vitess,rnavarro/vitess,pivanof/vitess,mlc0202/vitess,dumbunny/vitess,vitessio/vitess,alainjobart/vitess,kmiku7/vitess-annotated,pivanof/vitess,HubSpot/vitess,sougou/vitess,aaijazi/vitess,yaoshengzhe/vitess,yangzhongj/vitess,davygeek/vitess,mahak/vitess,mattharden/vitess,cloudbearings/vitess,guokeno0/vitess,anusornc/vitess,mattharden/vitess,yaoshengzhe/vitess,enisoc/vitess,skyportsystems/vitess,ptomasroos/vitess,aaijazi/vitess,sougou/vitess,ngaut/vitess,aaijazi/vitess,pivanof/vitess,erzel/vitess,tjyang/vitess,dcadevil/vitess,guokeno0/vitess,kmiku7/vitess-annotated,tjyang/vitess,aaijazi/vitess,dcadevil/vitess,mapbased/vitess,mahak/vitess,HubSpot/vitess,yangzhongj/vitess,pivanof/vitess,sougou/vitess,michael-berlin/vitess,dumbunny/vitess,cgvarela/vitess,tirsen/vitess,erzel/vitess,HubSpot/vitess,mlc0202/vitess,davygeek/vitess,dumbunny/vitess,michael-berlin/vitess,pivanof/vitess,kmiku7/vitess-annotated,alainjobart/vitess,cloudbearings/vitess,SDHM/vitess,mapbased/vitess,tinyspeck/vitess,ngaut/vitess,yaoshengzhe/vitess,rnavarro/vitess,SDHM/vitess,nurblieh/vitess,kuipertan/vitess,yangzhongj/vitess,dumbunny/vitess,yaoshengzhe/vitess,dcadevil/vitess,fengshao0907/vitess,cloudbearings/vitess,cgvarela/vitess,mapbased/vitess,dumbunny/vitess,erzel/vitess,fengshao0907/vitess,kmiku7/vitess-annotated,kuipertan/vitess,guokeno0/vitess,tjyang/vitess,skyportsystems/vitess,kuipertan/vitess,tirsen/vitess,anusornc/vitess,cgvarela/vitess,kuipertan/vitess,tirsen/vitess,rnavarro/vitess,cloudbearings/vitess,atyenoria/vitess,mlc0202/vitess,dumbunny/vitess,dumbunny/vitess,ptomasroos/vitess,mlc0202/vitess,AndyDiamondstein/vitess,SDHM/vitess,skyportsystems/vitess,AndyDiamondstein/vitess,atyenoria/vitess,cgvarela/vitess,pivanof/vitess,alainjobart/vitess,atyenoria/vitess,skyportsystems/vitess,netroby/vitess,fengshao0907/vitess,anusornc/vitess,ptomasroos/vitess,mlc0202/vitess,apmichaud/vitess-apm,ptomasroos/vitess,mattharden/vitess,tinyspeck/vitess,applift/vitess,aaijazi/vitess,dumbunny/vitess,applift/vitess,tjyang/vitess,ngaut/vitess,fengshao0907/vitess,netroby/vitess,tjyang/vitess,dcadevil/vitess,alainjobart/vitess,HubSpot/vitess,netroby/vitess,atyenoria/vitess,mattharden/vitess,atyenoria/vitess,yangzhongj/vitess,alainjobart/vitess,cgvarela/vitess,yangzhongj/vitess,enisoc/vitess,skyportsystems/vitess,dumbunny/vitess,rnavarro/vitess,kuipertan/vitess,cloudbearings/vitess,netroby/vitess,nurblieh/vitess,kmiku7/vitess-annotated,rnavarro/vitess,yaoshengzhe/vitess,erzel/vitess,fengshao0907/vitess,AndyDiamondstein/vitess,SDHM/vitess,ptomasroos/vitess,ngaut/vitess,xgwubin/vitess,xgwubin/vitess,atyenoria/vitess,cloudbearings/vitess,kmiku7/vitess-annotated,AndyDiamondstein/vitess,xgwubin/vitess,guokeno0/vitess,ptomasroos/vitess,AndyDiamondstein/vitess,pivanof/vitess,ngaut/vitess,mahak/vitess,nurblieh/vitess,mapbased/vitess,mapbased/vitess,davygeek/vitess,xgwubin/vitess,mattharden/vitess,rnavarro/vitess,netroby/vitess,kuipertan/vitess,mapbased/vitess,SDHM/v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