Add support in Context to persist Policies

See merge request !28

- pre-merge cleanup of policy persistence

- fix CI/CD pipeline unit tests

- pre-merge cleanup

Draft: New Descriptor Loader Framework and OFC'22 code migrations

See merge request !27

Added new KPI Sample Types

See merge request !18

- pre-merge fixes

- fixed show_logs_monitoring script
- Context Queries: added get_service, get_slice, get_topology methods
- Context Queries: corrected bug with get inter topology
- Moved old Build/Load Descriptor scripts to common
- Fixed retrieval of objects loaded from descriptors
- Deactivated close of clients in descriptor loader
- Moved MockOSM library to common tests/tools folder

Compute component:
- updated to use new context query methods
- updated to use new MockOSM location

OFC'22 tests:
- updated MockOSM paths
- updated fixtures
- added loggers
- corrected WIM service definitions
- improved verification of KPIs created and values returned
- optimized removal of entities
- optimized service discovery in delete test
- added on-line logging to tests

Lacks events.

Signed-off-by: mansoca <carlos.manso@cttc.es>

Enable P4 Driver to control multiple switches

See merge request !26

- updated WIM service settings

- updated test scripts

- updated descriptor loading framework

- updated MockOSM constants and helper methods

- updated generic descriptor loader tool
- updated scenario loader for automated tests

- fixed imports for bootstrap devices

- restored list of components

- migrated to new scenario loading framework

- migrated to new descriptor loading framework

- new generic descriptor loader tool
- new scenario loader for automated tests

- Code under migration to new Device, Service, Slice, PathComp, WebUI logic.

Integrate NFV-SDN'22 demo

See merge request !24

- added missing scenario README.md file

- activated build of gateway in deploy.sh script

- removed unused/unneeded files