feat(corectl): print hyphens for no-data in list-machines
feat(corectl): print hyphens for no-data in list-machines

coreos/fleet,dalbani/fleet,ecnahc515/fleet,esatterwhite/fleet,flandr/fleet,thepwagner/fleet,octoblu/fleet,jonboulle/fleet,dongsupark/fleet,improbable-io/fleet,giantswarm/fleet,mwitkow-io/fleet,thepwagner/fleet,jonboulle/fleet,esatterwhite/fleet,mwitkow/fleet,mwhooker/fleet,jonboulle/fleet,mookjp/fleet,WPMedia/fleet,giantswarm/fleet,improbable-io/fleet,paveltiunov/fleet,bcwaldon/fleet,bcwaldon/fleet,webwlsong/fleet,endocode/fleet,dalbani/fleet,ecnahc515/fleet,webwlsong/fleet,hhoover/fleet,wuqixuan/fleet,paveltiunov/fleet,dalbani/fleet,coreos/fleet,WPMedia/fleet,bcwaldon/fleet,mwhooker/fleet,endocode/fleet,mookjp/fleet,mischief/fleet,wuqixuan/fleet,giantswarm/fleet,mischief/fleet,flandr/fleet,octoblu/fleet,improbable-io/fleet,dongsupark/fleet,dongsupark/fleet,hhoover/fleet,ecnahc515/fleet,bviswana101/fleet,mwitkow-io/fleet,mwitkow/fleet,coreos/fleet,endocode/fleet,bviswana101/fleet