test(machine): add testing of Machine.HasMetadata
test(machine): add testing of Machine.HasMetadata

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