Added comments to document each class and method in the Centralized Attack Detector and Attack Mitigator components

Changed grpc calls to client in l3_attackmitigator and l3_centralizedattackdetector components and added attack mitigator port and name to constants

- Enabled the correct code in the Attack Mitigator component to properly configure ACL rules in the corresponding service to block detected attack connections.

- fix wrong import of TaskScheduler in _ServiceHandlerAPI interface and related files

fix(automation): ztpUpdate loop resolved

See merge request !6

Signed-off-by: Georgios P. Katsikas <gkatsikas@ubitech.eu>

- Removed deprecated Database Model within Service
- Corrected constructor signature of ServiceHandler interface
- Removed unneeded file in L3NMEmulated Service Handler
- Removed unused imports from TAPI Service Handler

- Removed deprecated PathComputationElement class
- Migrated old L3NMOpenConfig Service Handler to the new framework
- Removed unneeded file in L3NMEmulated Service Handler

OpenConfig Driver:
- added default endpoint type in case it cannot be retrieved from the remote device
- corrected network_instance/edit_config.xml template; wrong XML format

feat(policy): policy rule add/update/delete RPCs

See merge request !3

- Added basic support for ACL rules
- Corrected unitary tests

- solved bug with JSON descripotor file load.

WebUI:
- added icons for optical roadm and optical transponder

Common:
- added missing device types

Device:
- added missing emulated device driver mappings

Common:
- added device type for emulated pakcet switches

PathComp:
- added layer mapping for emulated pakcet switches

- Fixed endpoint UUIDs of OLS device, otherwise cleanup crashes due to different endpoint UUIDs randomly generated.
- Fixed create/delete service tests

- Corrected delete config rules in L2NMEmulated/L3NMEmulated/TAPI Service Handlers.
- Commented unneeded settings in L2NMEmulatedServiceHandler Config Rules

- added wait control while MonitoringDB is starting

- Implemented generic MutexQueues class
- Implemented sequentialization of operations in Device component to prevent data corruption and race conditions

- Added script to generate topologies and services using DC_CSGW_OLS
- Corrected script to generate topologies and services using DC_CSGW_TN_OLS
- Corrected resources imported by functional tests

- corrected components imported by the tests and default my_deploy.sh

- corrected deployment name in manifest file
- added resource requests and limits for monitoring server container

- Activated "Grafana" link in top menu
- Implemented onboarding of devices + configuration from JSON descriptor files
- added device status in device details page
- created new grafana dashboard for new PostgreSQL-based monitoring database
- updated deploy.sh script with correct configuration of Grafana monitoring datasource and new dashboard

Fixed the L3 security status KPIs monitoring in CentralizedAttackDetector component and cleaned the CentralizedAttackDetector service implementation

Device:
- fixed problem with subscription handling

- Improved look & feel of service and slice pages.

Common:
- added slice to EventTools

OFC'22 tests:
- corrected OFC'22 delete service test to identify appropriate service to be deleted
- removed usage of events for testing

Compute:
- remove diversity constraint when not populated

Device:
- removed unused field in database and code polishing

Service:
- migrated L3NMEmulatedServiceHandler to the new API
- polishing of code