- renamed tests: create/delete service to create/delete interdomain slice
- added missing checks over slices
- tests are still incomplete

- moved old code to a separate folder (temporary, until confirming it is useless)
- minor code clean-up

- implemented retrieval of Slices through REST-API

- fixed bug with slice retrieval
- code cleanup

- Added Mock Slice service
- Corrected Compute unit tests

Compute:
- added support for Slice creation when VPLS service is requested instead of VPWS

Context:
- minor improvements in client class logging
- added slice events to EventsCollector
- minor bug fixes in SliceModel

Interdomain:
- Implemented basic workflow

Monitoring:
- fixed requirements versions

Service:
- minor improvements in client and server logging

Slice:
- Implemented basic workflow

OECC/PSC'22 functional test:
- updated test objects
- updated deployment script
- updated exposed services

- improved loggers in decorators for client and server methods
- corrected error in delay_exponential for retry decorator

- Added RequestSlice to Interdomain
- Separated Create and Update in Slice

- Implemented support for Slices
- missing: unitary tests

- defined test objects (contexts, topologies, devices, links, service)
- updated bootstrap test script
- updated create service test script
- updated deploy script

- formatted and corrected interdomain and slice proto files
- regenerated associated Python code files per component

fix: broken P4 tests

See merge request teraflow-h2020/controller!99

Merge branch 'feat/slice-service' of https://gitlab.com/teraflow-h2020/controller into feat/interdomain

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>