/usr/share/fusiondirectory/plugins/ is in fusiondirectory-plugin-dns 1.0.8.8-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fusiondirectory/plugins/admin/
/usr/share/fusiondirectory/plugins/admin/systems/
/usr/share/fusiondirectory/plugins/admin/systems/services/
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/class_DNS.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/class_serviceDNS.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/class_serviceDNSeditZone.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/class_serviceDNSeditZoneEntries.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/serviceDNS.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/serviceDNSeditZone.tpl
/usr/share/fusiondirectory/plugins/admin/systems/services/dns/serviceDNSeditZoneEntries.tpl
/usr/share/fusiondirectory/plugins/config/
/usr/share/fusiondirectory/plugins/config/dns/
/usr/share/fusiondirectory/plugins/config/dns/class_dnsConfig.inc