Make KeyspaceId a Stringer.
Make KeyspaceId a Stringer.

This allows for human-readable keyspace IDs, rather than invalid-unicode
binary blobs in logs.

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