- Added backend for NATS message broker
- removed unneeded test script

- disabled Redis MessageBroker backend

Common:
- Implemented Message Brokering framework supporting multiple backends
- Implemented InMemory Message Brokering Backend for testing purposes
- Implemented Redis Backend
- Implemented Message Brokering unit tests
- Minor improvements in ORM Framework
- Added Message Broker framework unit testing into automated local tests

Common:
- Added missing test units for ORM framework
- Solved few bugs in ORM framework
- Implemented initial skeleton of MessageBroker to implement GetEvents methods for Context.

Context:
- Implemented TopologyModel and related test units
- Solved few bugs in ContextModel