feat(muffins): fix key ordering
feat(muffins): fix key ordering

put the unit name first, then the machine id. This way we can discover all instances of a unit.

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