Fixed the index generation on startup

Solved in this issue (closes #368):

• Single topic exchange "dbrepo"
• Single quorum queue "dbrepo"
• Consumers managed by Spring AMQP, not by RabbitMQ library in data service
• AMQP topic permissions per database / table (depending on the access read, write_own=table permission, write_all=database permission)
• Added RabbitMQ basic auth
• Broker information only when permissions present in the DTO

Solved, but not in the issue:

• My databases in the UI
• Mapping usernames in DTOs for the UI (fully-qualified)
• Mapping identifiers in Entities (backend)
• Annoying JUnit sniffer logs