registry: remove job and jobs from EtcdRegistry entirely
registry: remove job and jobs from EtcdRegistry entirely

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