Port existing catalog configuration to Spring Open Service Broker

[spiegela]

Background
When this service-broker was originally developed, the Spring Cloud Foundry Service Broker project did not support dynamic catalog configuration. Since this was a requirement for our user-base, the ECS service broker developed its own ad-hoc implementation for dynamic catalog configuration via Spring Configuration.

Now that this project has updated to Spring Open Service Broker, and it supports a standard for catalog configuration via properites, this project can be updated to support this feature, and the previous catalog configuration classes can be eliminated.

Upgrade migrations will need to be implemented & tested the ECS Broker Tile to ensure that existing tile consumers may upgrade to the new catalog configuration.