CatalogService does not initialize region if regionless = true

[tmilos]

Regionless services, like DNS does not get initialized with region and fail on
Rackspace::dnsService
ServiceBuilder::factory
CatalogService::__construct
CatalogService::findEndpoint
CatalogItem::getEndpointFromRegion
line 139 with message
This service [cloudDNS] does not have access to the [] endpoint.

[tmilos]

Duplicate of #344