Merge branch 'feat/#40' into 'dev'

e2clab/app.py

e2clab/cli.py

e2clab/constants/default.py

e2clab/constants/layers_services.py

e2clab/errors.py

e2clab/experiment.py

e2clab/managers/__init__.py

e2clab/managers/manager.py

e2clab/managers/monitoring_kwollect.py

e2clab/probe.py

e2clab/providers/plugins/G5k.py

e2clab/schemas/layers_services_schema.py

e2clab/tests/unit/test_managers.py

e2clab/tests/unit/test_probe.py