CB: Add periodic fetch of the incremental DHCPv6 configuration changes
The Config Backend design: https://gitlab.isc.org/isc-projects/kea/wikis/designs/configuration-in-db-design#kea-configuration-backend-design calls for implementing a periodic fetch of configuration changes in the database. If there are changes detected these changes are applied to the CfgMgr. This ticket covers implementing such mechanism in the DHCPv6 server.
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