- Subscriptions to be implemented

Common:
- Normalized report_coverage_*.sh scripts, and temporarily summarized results in device one for testing purposes.
- Adapted run_tests_locally.sh script for testing purposes
- Improved message synthesis of ServiceException

Context:
- Improved ConfigModel helper functions

Device (intermediate backup):
- Removed DataCache since it reduces readability of the code. Moved database one level up.
- Improved ServicerImpl and moved DataCache functionality over there.
- Added condition to prevent AddDevice request from carrying a configuration.
- Multiple pre-work required for processing configuration differences in DeviceServiceServicerImpl.

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/device-adapt-to-context-api

- Added method to delete config rules when action is DELETE.
- Temporary changes in run_tests_local.sh scripts

- Multiple minor bug resolutions
- DeviceClient: solved logging bug
- EmulatedDriver: solved GetConfig bug and added event to prevent double connection requests
- DriverInstanceCache, DriverFactory: Added formatting of filter fields
- DataCache: solved minor bug
- DriverAPI test unit: corrected getconfig assertion check
- Device test unit: reimplemented, first complete test after component reworking
- DataCache/DeviceTools: solved several minor bugs
- DeviceServiceServicerImpl: added removal of drivers and endpoints when device is removed.

Minor fixes to correct CI/CD issues.

See merge request teraflow-h2020/controller!31

Multiple fixes to correct problems with common.database in Compute, Service and CentralizedAttackDetector.

See merge request teraflow-h2020/controller!30

- Corrections in Service to prevent errors in GitLab CI/CD pipeline.
- Minor improvements in random classes.

Merge monitoring-service to develop

See merge request teraflow-h2020/controller!28

# Conflicts:
#   .gitignore
#   .gitlab-ci.yml

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/device-adapt-to-context-api