[rackspace|identity] fixing broken identity tests
[rackspace] updated services to re-authenticate when authentication token expires.
[rackspace|dns] fixing broken tests
merging with master
[rackspace] adding block and parse_json parameters to request parameter calls
[rackspace|cdn] updating cdn to throw exceptions from storage namespace rather than cdn. This was done for historical reasons.
Merge branch 'master' of github.com:fog/fog into reauth
Merge branch 'master' of github.com:fog/fog into reauth
Merge pull request #1939 from rackspace/reauth

[rackspace] Reauthenticate and retry request when authentication token expires