- Add config-control section to Kea config template for automatic subnet
  fetching from PostgreSQL database
- Fix cb_cmds hook to use KEA_DB_NAME (kea_dhcp) instead of kea_app so
  subnets stored via remote-subnet4-set are fetchable by config-backend-pull
- Add automatic cleanup of conflicting host DHCP services during install
  and upgrade (stops kea-dhcp4, isc-dhcp-server, dhcpd services)
- Kill any non-containerized kea-dhcp4 processes before starting
- Update version to 3.1.2

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Co-Authored-By: Claude <noreply@anthropic.com>