Resolve "(CTTC) Multiple Bug Fixes affecting `common` code"

Closes #96

See merge request !181

- `common` > `tests` > `InMemoryObjectDatabase.py`: enhance log error reporting
- `common` > `tools` > `descriptor` > `Tools.py`: correct formatting of non-string resource_values in custom config rules in method `format_custom_config_rules()`
- `common` > `tools` > `service` > `GenericRestServer.py`: correct format of reported listen URL

Merge branch 'feat/95-cttc-extend-context-component-to-explicitly-add-devices-and-links-to-particular-topologies' into 'develop'

Resolve "(CTTC) Extend Context component to explicitly add devices and links to particular topologies"

Closes #95

See merge request !180

- Changed default values to False for config flags ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY and ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY

- Added config flag ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY
- Added config flag ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY
- Added logic to explicitly add devices and links to topologies

- Enabled explicit addition of devices and links to topologies

- Corrected return type in Topology methods

- Extended MockServicerImpl_Context to add/remove topologies, services and slices to/from contexts

- Added config flag ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY
- Added config flag ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY

Fix: Policy configuration of context_policy client

See merge request !175

Merge branch 'develop' of https://labs.etsi.org/rep/tfs/controller into fix/policy/context_policy-configuration

Feat/83 ubi change package naming for policy and ztp

Closes #83

See merge request !174

Resolve "(TID) Fix add device tab via WebUI"

Closes #88

See merge request !171

Resolve "Rename and reorganize NBI component"

Closes #45

See merge request !169

- Updated requirements.in

- Moved prefix "/restconf" to appropriate plugins

Resolve "(CTTC) Forecaster component"

Closes #1

See merge request !160

- Added missing copyright headers

- Cleaned up tests/data/README.md

- Improved tests/data/README.md
- Added log messages to TopologyTools.py

- Added script show_logs_forecaster.sh

- Added Link Attributes to Details page
- Added formatting of Schedule Constraints in Service and Slice Details page

- Added manual test files, descriptors, and README.md
- Minor corrections in test tools

- Corrected data files in unit tests with forecaster

- Added forecaster component

- Removed unneeded and renamed data files
- Removed unneeded old code
- Code cleanup

- Updated port in Forecaster's manifest

- Fixed assertions in pathcomp-forecaster tests

- Fixed unitary tests fixtures
- Fixed assertions in pathcomp-forecaster tests

- Fixed unitary tests fixtures

- Added setting ENABLE_FORECASTER to pathcomp manifest