functional: manually set authorized_keys
functional: manually set authorized_keys

Calling update-ssh-keys is racy with user creation, so bypass the
race by managing the core users authorized_keys file directly.

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