[chef] Registering client when old client exists.

[John Hanks < >]

Hello,

Before upgrading to 0.8.16 when my nodes booted they registered
themselves regardless of whether or not a client with the same  name
existed. With my fresh install of 0.8.16, this behavior has changed
and rebooted nodes fail to register because of the existing client. Is
there a way I can select/revert the old behavior? My nodes are
diskless and boot from a common base OS image so while it's trivial to
have a validation.pem on the image, it'd be complicated and kludgy to
work out how to keep track of the client.pem for every client/node
across reboots.

Thanks,

griznog