Add option to pass a socket file to mysqlctl.
Add option to pass a socket file to mysqlctl.

erzel/vitess,kuipertan/vitess,guokeno0/vitess,fengshao0907/vitess,michael-berlin/vitess,mapbased/vitess,CERN-Stage-3/vitess,mahak/vitess,aaijazi/vitess,kuipertan/vitess,kmiku7/vitess-annotated,skyportsystems/vitess,anusornc/vitess,mattharden/vitess,erzel/vitess,SDHM/vitess,guokeno0/vitess,michael-berlin/vitess,tinyspeck/vitess,skyportsystems/vitess,pivanof/vitess,SDHM/vitess,tjyang/vitess,aaijazi/vitess,yangzhongj/vitess,mattharden/vitess,yaoshengzhe/vitess,aaijazi/vitess,netroby/vitess,tinyspeck/vitess,ptomasroos/vitess,mlc0202/vitess,netroby/vitess,vitessio/vitess,cgvarela/vitess,tirsen/vitess,kuipertan/vitess,SDHM/vitess,guokeno0/vitess,cloudbearings/vitess,davygeek/vitess,aaijazi/vitess,atyenoria/vitess,xgwubin/vitess,sougou/vitess,alainjobart/vitess,kuipertan/vitess,tinyspeck/vitess,pivanof/vitess,pivanof/vitess,sougou/vitess,dcadevil/vitess,tjyang/vitess,yaoshengzhe/vitess,mlc0202/vitess,tirsen/vitess,cloudbearings/vitess,SDHM/vitess,vitessio/vitess,ptomasroos/vitess,ptomasroos/vitess,HeisenbergUncertain/vitess,yaoshengzhe/vitess,mapbased/vitess,davygeek/vitess,skyportsystems/vitess,mattharden/vitess,ptomasroos/vitess,dcadevil/vitess,kmiku7/vitess-annotated,mattharden/vitess,atyenoria/vitess,ptomasroos/vitess,applift/vitess,ngaut/vitess,dumbunny/vitess,pivanof/vitess,guokeno0/vitess,mahak/vitess,ptomasroos/vitess,erzel/vitess,skyportsystems/vitess,alainjobart/vitess,cloudbearings/vitess,apmichaud/vitess-apm,CERN-Stage-3/vitess,mahak/vitess,HubSpot/vitess,rnavarro/vitess,cgvarela/vitess,rnavarro/vitess,cgvarela/vitess,HubSpot/vitess,kuipertan/vitess,tinyspeck/vitess,tirsen/vitess,rnavarro/vitess,netroby/vitess,xgwubin/vitess,mattharden/vitess,AndyDiamondstein/vitess,mlc0202/vitess,yaoshengzhe/vitess,guokeno0/vitess,CERN-Stage-3/vitess,alainjobart/vitess,skyportsystems/vitess,dumbunny/vitess,xgwubin/vitess,aaijazi/vitess,ngaut/vitess,kmiku7/vitess-annotated,cgvarela/vitess,skyportsystems/vitess,aaijazi/vitess,CERN-Stage-3/vitess,pivanof/vitess,kmiku7/vitess-annotated,xgwubin/vitess,AndyDiamondstein/vitess,tjyang/vitess,tjyang/vitess,sougou/vitess,vitessio/vitess,aaijazi/vitess,fengshao0907/vitess,HeisenbergUncertain/vitess,netroby/vitess,mattharden/vitess,cloudbearings/vitess,skyportsystems/vitess,mahak/vitess,tinyspeck/vitess,erzel/vitess,yangzhongj/vitess,aaijazi/vitess,davygeek/vitess,yangzhongj/vitess,atyenoria/vitess,applift/vitess,atyenoria/vitess,applift/vitess,tirsen/vitess,ngaut/vitess,vitessio/vitess,ngaut/vitess,dumbunny/vitess,kmiku7/vitess-annotated,kuipertan/vitess,vitessio/vitess,apmichaud/vitess-apm,mahak/vitess,dumbunny/vitess,aaijazi/vitess,sougou/vitess,tinyspeck/vitess,anusornc/vitess,yaoshengzhe/vitess,enisoc/vitess,vitessio/vitess,mlc0202/vitess,mattharden/vitess,HeisenbergUncertain/vitess,alainjobart/vitess,yangzhongj/vitess,mahak/vitess,anusornc/vitess,atyenoria/vitess,nurblieh/vitess,sougou/vitess,atyenoria/vitess,alainjobart/vitess,enisoc/vitess,atyenoria/vitess,tirsen/vitess,kuipertan/vitess,tjyang/vitess,rnavarro/vitess,rnavarro/vitess,apmichaud/vitess-apm,tjyang/vitess,mapbased/vitess,dumbunny/vitess,kmiku7/vitess-annotated,xgwubin/vitess,HubSpot/vitess,dumbunny/vitess,michael-berlin/vitess,SDHM/vitess,mapbased/vitess,skyportsystems/vitess,mlc0202/vitess,sougou/vitess,cloudbearings/vitess,applift/vitess,michael-berlin/vitess,rnavarro/vitess,applift/vitess,apmichaud/vitess-apm,applift/vitess,cloudbearings/vitess,fengshao0907/vitess,tinyspeck/vitess,anusornc/vitess,netroby/vitess,tirsen/vitess,yangzhongj/vitess,alainjobart/vitess,rnavarro/vitess,SDHM/vitess,AndyDiamondstein/vitess,dcadevil/vitess,AndyDiamondstein/vitess,HubSpot/vitess,kuipertan/vitess,SDHM/vitess,mapbased/vitess,anusornc/vitess,mlc0202/vitess,vitessio/vitess,michael-berlin/vitess,mlc0202/vitess,guokeno0/vitess,pivanof/vitess,HeisenbergUncertain/vitess,guokeno0/vitess,fengshao0907/vitess,erzel/vitess,applift/vitess,michael-berlin/vitess,nurblieh/vitess,xgwubin/vitess,AndyDiamondstein/vitess,xgwubin/vitess,yangzhongj/vitess,nurblieh/vitess,erzel/vitess,kmiku7/vitess-annotated,ptomasroos/vitess,yaoshengzhe/vitess,SDHM/vitess,tjyang/vitess,dcadevil/vitess,kmiku7/vitess-annotated,mattharden/vitess,apmichaud/vitess-apm,vitessio/vitess,AndyDiamondstein/vitess,yangzhongj/vitess,dumbunny/vitess,mapbased/vitess,fengshao0907/vitess,AndyDiamondstein/vitess,mapbased/vitess,anusornc/vitess,pivanof/vitess,rnavarro/vitess,dcadevil/vitess,mahak/vitess,anusornc/vitess,enisoc/vitess,nurblieh/vitess,alainjobart/vitess,xgwubin/vitess,michael-berlin/vitess,kuipertan/vitess,cgvarela/vitess,atyenoria/vitess,guokeno0/vitess,netroby/vitess,netroby/vitess,fengshao0907/vitess,kmiku7/vitess-annotated,alainjobart/vitess,yaoshengzhe/vitess,CERN-Stage-3/vitess,mapbased/vitess,dumbunny/vitess,nurblieh/vitess,cgvarela/vitess,dcadevil/vitess,dcadevil/vitess,cloudbearings/vitess,erzel/vitess,mattharden/vitess,yaoshengzhe/vitess,HubSpot/vitess,HubSpot/vitess,mlc0202/vitess,cgvarela/vitess,enisoc/vitess,ptomasroos/vitess,enisoc/vitess,fengshao0907/vitess,dumbunny/vitess,michael-berlin/vitess,anusornc/vitess,nurblieh/vitess,yaoshengzhe/vitess,HubSpot/vitess,netroby/vitess,cloudbearings/vitess,davygeek/vitess,davygeek/vitess,netroby/vitess,nurblieh/vitess,nurblieh/vitess,guokeno0/vitess,applift/vitess,tirsen/vitess,applift/vitess,pivanof/vitess,nurblieh/vitess,erzel/vitess,tjyang/vitess,SDHM/vitess,xgwubin/vitess,rnavarro/vitess,tirsen/vitess,yangzhongj/vitess,pivanof/vitess,davygeek/vitess,mattharden/vitess,mlc0202/vitess,cloudbearings/vitess,tirsen/vitess,cgvarela/vitess,ngaut/vitess,AndyDiamondstein/vitess,ptomasroos/vitess,applift/vitess,skyportsystems/vitess,yangzhongj/vitess,dumbunny/vitess,mahak/vitess,HubSpot/vitess,sougou/vitess,atyenoria/vitess,michael-berlin/vitess,erzel/vitess,cgvarela/vitess,anusornc/vitess,enisoc/vitess,mapbased/vitess,tjyang/vitess,mapbased/vitess,enisoc/vitess,fengshao0907/vitess,sougou/vitess,erzel/vitess,fengshao0907/vitess,davygeek/vitess,AndyDiamondstein/vitess