Re: [jclouds] Fix rackspace volume attach with modernized base tests (#710)

[Zack Shoylev]

This supercedes https://github.com/jclouds/jclouds/pull/709
Meaning we can just merge this and it should fix the issues.

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https://github.com/jclouds/jclouds/pull/710#issuecomment-83887062