Azure: doesn't set hostname about afterburn HOT 4 CLOSED

I tried it, and Azure DHCP apparently is not sending the hostname when requested to. On Container Linux I think WALinuxAgent is setting the hostname. So implementing in Afterburn and running that in the initramfs seems like the right approach.

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@jpang @imcleod @awesomenix

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I seem to remember the Azure DHCP is able to hand out the hostname to a node via DHCP (Option-12, possibly), which would be the reason why Afterburn doesn't have to take care of that.

Is either the DCHP client not asking/handling that option, or the server not providing it?

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Then I was mixing up with some other cloud provider, and we have indeed to add such logic to Afterburn.

While I didn't see a JSON schema for the metadata response, there are comprehensive examples and docs at https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service#getting-more-information-about-the-vm-during-support-case. As we don't care about other properties in there for the moment, the individual textual-format field is probably a better target to consume.

For completeness, this seems to cover host name only (not node FQDN).

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