feat(API): Return error entities with unit 406s
feat(API): Return error entities with unit 406s

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