Added blockstorage v1 volumes_api models and unittests.

* Moved config to common/config.  V1 config inherits from it now.
* Added automarshalling module for volumes_api common model code.
* Response models now deserialize metadata and links correctly.
* Added unittests for response models.
* Added unittests for wait behavior methods

Change-Id: Ic261b8af13cc438d2f4da532d87dd37c420f035a
Merge "Added blockstorage v1 volumes_api models and unittests."