Update version to v4.1.5
"RegionOne" attribute cleanup

Use node["osops"]["region"] instead of "RegionOne" string.

Renamed `swift["swift_store_region"]` default attribute--which
wasn't used anywhere--to `kong["swift_store_region"]` (which the code
already referenced).
Merge pull request #43 from invsblduck/v415_region_cleanup

Merged automatically by jenkins after successful build test