gce provider should stop using deprecated zone europe-west1-a

[Dimiter Naydenov]

According to the release notes (https://cloud.google.com/compute/docs/release-notes#october152014) from October 2014, the "europe-west1-a" availability zone is deprecated and will be removed along with all instances in it on March 29th, 2015. Not much time left and provided the list of zones is dynamically discovered perhaps even nothing needs to be done, but I've decided to file a bug anyway.

[Eric Snow (ericsnowcurrently)]

Yeah, the list of zones is queried via the GCE API at run-time. So you're right. :) Given the release timeframe for 1.23 we don't need to worry about "europe-west1-a". However, I'll make sure there is a brief mention of it in the release notes.

[Dan Watkins (daniel-thewatkins)]

The latest adamisrael/juju-trunk Docker image is still attempting to use europe-west-1a despite the fact it has been deleted since Sunday.

It looks like this is probably because it is still being returned from the API (with deprecation information), despite it being actually gone.

[Eric Snow (ericsnowcurrently)]

The provider should be using the deprecation information from the GCE API:

https://cloud.google.com/compute/docs/reference/latest/zones#resource

If we don't fix this, future deprecated zones will break the provider in the same way.