Add additional potential domain env vars

[Jamstah]

Potential variables for the domain are listed in this openstack doc: http://docs.openstack.org/developer/python-openstackclient/authentication.html

[Jamstah]

@axw would you mind reviewing this one?

[mjs]

This is probably fine but I just want some clarification.

[mjs]

I know very little about OpenStack. Can you explain why you chose these env vars specifically? There's more listed here: http://docs.openstack.org/developer/python-openstackclient/authentication.html#authenticating-using-identity-server-api-v3

[Jamstah]

Do you mean the _ID ones? Could be a good idea to add them but I don't know goose so it would need testing to check it still works, or if it would need extending to cope.

I choose them based on the open stack doc and my experience, and guessed at a sensible order. I haven't checked which ones the open stack command line reads, or their preference order, that could be another thing to do.

What do you think?

[mjs]

Sounds OK to me. Ship it :)

[wallyworld]

Closing this PR as support for the extra env vars was recently added in a different PR.