refactor(policy): refactor PolicyService & PolicyGateway interfaces

See merge request teraflow-h2020/controller!149

- Minor formatting of OFC'22 page.

MicroK8s deployment scripts:

See merge request teraflow-h2020/controller!148

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

- deploy.sh: clarified some descriptions of environment variables
- install_requirements.sh: integrated common requirements and selection of components based on the deploy
- my_deploy.sh: added description of environment variables

- Added subfolder rest_server/nbi_plugins/ietf_network_slice
- Modified and created classes to register new URLs in the REST server
- Skeleton for methods GET/POST/DELETE
- Refactoring: moved "tools" subfolder one level up

feat(policy): introduce ServiceService & ServiceGateway interfaces

See merge request teraflow-h2020/controller!147

Policy/implement monitoring service interface

See merge request teraflow-h2020/controller!146

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

- Fixed wrong imports

- Corrected object name in scale commands

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

- Fixed object names in L3_* manifest files
- Corrected object name in scale commands

- Corrected error with log file name generated for deploy stages during TFS deployment.

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

- Arranged requirement versions of L3 CentralizedAttackDetector
- Fixed object names in L3_* manifest files
- Corrected error with log file name generated for deploy stages during TFS deployment.

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

Adapted L3_AttackMitigator/L3_CentralizedAttackDetector/L3_DistributedAttackDetector to common proto folder

- Arranged Dockerfile COPY commands

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/microk8s-deployment

Adapted L3_AttackMitigator/L3_CentralizedAttackDetector/L3_DistributedAttackDetector to common proto folder

See merge request teraflow-h2020/controller!145

Adapted L3_AttackMitigator/L3_CentralizedAttackDetector/L3_DistributedAttackDetector to common proto folder
- Moved imports from *.proto folder to common.proto folder
- Removed genproto.sh scripts
- Arranged requirements to accelerate Docker image creation
- Minor code and linting fixes
- Updated Dockerfile
- Arranged GitLab CI/CD pipeline

- Corrected wrong file name.

Adds some preliminary documentation for setting up a VMWare VM

See merge request teraflow-h2020/controller!137

- Minor refinements and styling of VMWare Fusion section.

Policy/implement context service interface

See merge request teraflow-h2020/controller!144

Update Flask version on Compute and Context components

See merge request teraflow-h2020/controller!143

Automation/update device domain model

See merge request teraflow-h2020/controller!142