add returncode as one of return values from utils.run method
add returncode as one of return values from utils.run method

This change allows caller to know whether the vtctl command fails or not.

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