Support for setting Locator Id to enable geo-diverse streaming redundancy

Added support to set the locator Id when creating an Origin locator. This feature is useful when you want to mirror a library of streaming assets across WAMS accounts in two different Azure data centers to enable geo-diverse redundancy. By replicating the locator Ids, both assets share the same relative streaming URL in both data centers (only base URLs are different). (https://replicator.codeplex.com/)