* BAEL-5323: Spring Boot with multiple data sources
* BAEL-5323: small fixes
* BAEL-5323: fix test class
* BAEL-5323: Refactor configuration classes
* BAEL-5323: Set proeprty to private
* BAEL-5323: rename test class to follow naming conventions
* BAEL-5323: merge sources into existing persistence module
* BAEL-5323: merge sources into existing persistence module