[Delivers #47686697] Updated the Rackspace Provider names to match the Rackspace Cloud Services names

https://www.pivotaltracker.com/story/show/47686697

### Changes
- Renamed the following providers
    - __ComputerProvider__ _to_ __CloudServersProvider__
    - __IdentityProvider__ _to_ __CloudIdentityProvider__
    - __ObjectStoreProvider__ _to_ __CloudFilesProvider__
- Fixed a few naming convention issues.