RFE: default openstack `api_version` to latest

[ktdreyer]

Feature Request

libcloud/compute/drivers/openstack.py defaults to API version "1.1".

DEFAULT_API_VERSION = '1.1'

It would be nice to default to the very latest API version ("2.2" as of this writing) so that new libcloud users can get started with the latest code easily.

[Kami]

Yeah, this seems a reasonable change to me.

But perhaps we should default it to current latest (2.2) to avoid issues when a new version is released?

Having said that - are you willing to make that change? Should be a small code + tests change and we should also add entry to docs upgrade notes.

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