Deactivated some Device monitoring functionality partially implemented to enable a functional commit into develop.

- Adapt component and unitary tests to support configuration environment variables

- Final version of Context service ready for integration tests
- Integrated REST API read-only methods
- Updated test units for gRPC and REST API interfaces
- Improved flag for pre-populating database with fake testing data
- Combined Redis within Context POD

Context service:
- corrected port numbers

Device service:
- corrected port numbers
- upgraded gitlab-ci configuration