Merge branch 'feat/pathcomp-component' of https://gitlab.com/teraflow-h2020/controller into feat/ecoc22-dc-interconnect-disjoint

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/ecoc22-dc-interconnect-disjoint

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/pathcomp-component-frontend

- Implemented temporary hack to reduce memory used

Update 1-1-1-create-vm-oracle-virtualbox.md to clarify Ubuntu Server should be use instead of Desktop

- partial integration of PathComp with Service
- ongoing work

refactor(policy): add validation at PolicyRuleDevice

See merge request teraflow-h2020/controller!161

refactor(policy): add validation at PolicyRuleService

See merge request teraflow-h2020/controller!160

refactor(policy): add validation at PolicyRuleCondition

See merge request teraflow-h2020/controller!159

Merge branch 'feat/pathcomp-component-frontend' of https://gitlab.com/teraflow-h2020/controller into feat/ecoc22-dc-interconnect-disjoint

- made frontend a module

Merge branch 'feat/pathcomp-component-frontend' of https://gitlab.com/teraflow-h2020/controller into feat/ecoc22-dc-interconnect-disjoint

- Arranged GitLab CI/CD
- Relocated test files