fix(purge): Simplify graceful agent shutdown
fix(purge): Simplify graceful agent shutdown

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