update kube-register (0.0.4) in getting started guides

[antoineco]

kube-register v0.0.4 can now register minions via hostnames using the --reverse-lookup option, making it unnecessary to override the hostname in the kubelet (--hostname-override)

[justinsb]

I actually am not very familiar with the cloud formation templates. I think this is a CoreOS thing - @bakins are you the right person to look at this?

[antoineco]

I didn't do any magic inside the Cloudformation template, it's actually just a copy/paste of the changes I applied to the cloud-config YAMLs.

[bakins]

LGTM, but I'd like to get @kelseyhightower 's opinion as well, since he maintains kube-register

[k8s-bot]

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[kelseyhightower]

+1 on the update to v0.0.4 and using the new URL for download.

[roberthbailey]

FYI, with the 0.18.0 release next week the kubelet should self-register with the master and from testing that a few folks have done on CoreOS it should no longer be necessary to run kube-register.

[antoineco]

@roberthbailey I just saw your comment in #6087, looking forward to it :)
I will create a new pull-request when 0.18.0 is out.

[k8s-bot]

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