/usr/share/fusiondirectory/plugins/admin/systems/ is in fusiondirectory-plugin-argonaut 1.0.8.2-5+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fusiondirectory/plugins/admin/systems/argonaut/
/usr/share/fusiondirectory/plugins/admin/systems/argonaut/class_argonautClient.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautDNSConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautFuseConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautFuseFAIConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautFuseLTSPConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautFuseOPSIConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautMirrorConfig.inc
/usr/share/fusiondirectory/plugins/admin/systems/services/argonaut/class_argonautServer.inc