Adapted L3_AttackMitigator/L3_CentralizedAttackDetector/L3_DistributedAttackDetector to common proto folder

- Arranged Dockerfile COPY commands

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

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

reformat(policy): Update Service domain model

See merge request teraflow-h2020/controller!140

feat(policy): introduce Serializer module

See merge request teraflow-h2020/controller!112

Policy/update domain models

See merge request teraflow-h2020/controller!139

fix(automation): remove grpc-server port from K8s manifest

See merge request teraflow-h2020/controller!138

chore(automation): exclude acl package from code coverage report

See merge request teraflow-h2020/controller!133

feat(automation): add acl.proto in path and update domain models

See merge request teraflow-h2020/controller!132

Arranged ConfigRules in WebUI component and OFC'22 functional test

See merge request teraflow-h2020/controller!131

- Corrected device descriptors to take into consideration new ConfigRules.

- Corrected templates to take into consideration new ConfigRules.

Fix for WebUI tests

See merge request teraflow-h2020/controller!130