Create AuditRevision object to carry supplementary information for audit entries
The CB database includes
dhcp4_audit_revision table which holds general information about the changes applied in the database. Currently it holds a timestamp and the log message. The timestamp is and will remain being generated automatically. The log message is also generated automatically at the moment but the idea is to be able to specify the log message in the command. Some examples can be found here:
In the future we may store more information in the revision table. For example: name of the user who applied a change, IP address from which the command has been sent etc. This information must be encapsulated in a new object, e.g. AuditRevision and passed via the CB API to the commands that modify the information in the database, i.e. set and del commands.
Even though we could postpone this change to later Kea release, it may be actually better to add it now to keep the API stable in next releases.