switch to using the new KeystoneHelper

Rename the keystone_service_* attributes to be consistent with the other
cookbooks and make it possible for the new keystone_settings to use.

Skipped a few migration numbers to leave space for roxy changes.
Merge pull request #245 from mapleoin/keystone-settings

switch to using the new KeystoneHelper
Remove trailing whitespace
Switch to KeystoneHelper

SwiftHelper has been removed, use KeystoneHelper
directly.
Merge pull request #246 from dirkmueller/release/stoney/master

mkcloud failures
Fix typo in last commit
Merge pull request #247 from dirkmueller/release/stoney/master

Fix typo in last commit