Comment 2 for bug 1768876

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Matt Riedemann (mriedem) wrote : Re: Old instances can get AVZ from metadata

Found it, this was the change, https://review.openstack.org/#/c/446053/, in Pike.

I'm not sure what to do here, I guess if the instance.get('availability_zone') returns None, we have to fallback to trying to do the up-call.