- adapted cockroachdb_client script to be usable in cluster and single mode

- updated manifests to v22.2.0
- renamed namespace to crdb
- added script to launch cockroachdb client

- corrected run_test scripts

- updated OFC'22 test scripts with source of env variables
- activated DEBUG logs in Device and Service components
- added Slice as dependency of Compute
- removed creation of services in Compute, all goes through Slice
- Added missing default constraints in PathComp Frontend
- added logic in Slice to identify if its L2 or L3

- corrected device and endpoint names
- corrected bearer definitions
- deleted unneeded/redundant scripts
- removed code coverage from test executions
- added separate script for test and code coverage
- moved OFC'22 README to the tutorial folder