Update vulnerability assessment knowledge database script

[eren-ck]

PL/pgSQL script to update the vulnerability assessment knowledge database.

For more details please see the file header comment of rest-backend/src/main/resources/db/update_knowledge_db.sql

[serenaponta]

The script updates the tables with the IDs coming from the exported data which may be higher than the current value of the sequence 'hibernate_sequence'. To ensure the proper working of the steady backend, the hibernate sequence should be updated to the max value of the imported ids.

Still, in general it may happen that the imported data use an ID which is already used for some row in the target database. I think the consequences of such collision will strongly depend on which are the entities among which the collision occur. If the script is to be used just for an initial import, i think this risk can be accepted.

[henrikplate]

@eren-ck With the development of kb-importer, a tool importing vulnerabilities maintained with and coming from Project KB, this database script is not needed anymore. Let me thank you nevertheless, Cheers, Henrik