OpenStack Hp storage provider support for CC blobstore

This PR adds OpenStack HP provider storage support for the CC blobstore. 

Commit https://github.com/anynines/cloud_controller_ng/commit/c299dc2ed77f1f2ded1113bf4c7ca64ed6467b18
 ensures that the hp_auth_version defined in the fog configuration file is passed to the Fog storage provider as a symbol, because symbols are converted to Strings in the bosh deployment chain.

We created another pull request for the fog gem that applies this behaviour to the fog gem: https://github.com/fog/fog/pull/2197

If the fog PR is applied and the fog version of the CC is updated, we can remove the additional symbol conversion in the CC again.

We will provide an example configuration in a following PR to the cf-release repository.