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

Merge Hackfest material into Develop

See merge request !11

Tutorials cleanup

See merge request !10

Pass on the tutorials to (i) verify that all parts are complete (did not run the installation procedures); (ii) updated instructions on how to select the Python version; (iii) general aestetic changes.

doc/fix: add instructions for ngsdn-tutorial mininet

See merge request !9

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

- integrated command files
- moved unused command listings to separate folders
- polished data files
- cleaned up TAPI show topology script and context database
- added TFS descriptor files

NetworkX 22 P4 workshop

See merge request !7

fix(device): avoid conversion to canonical bytes

See merge request !8

Also, remove unecessary conditions prior to rule
insert/update/delete operations

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

- added bearers for Hackfest

- added MockOSM package

- refined TrandportAPIDriver endpoint retrieval
- refined Driver selection

- added "Delete Service" button

- added basic Netconf/OpenConfig server

- added support for json-formatted custom config rules

- updated tapi_app to plot topologies

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

- updated TAPI exercise

- 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>