/usr/share/gosa/plugins/ is in gosa-plugin-ldapmanager 2.7.4+reloaded2-1+deb8u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/addons/
/usr/share/gosa/plugins/addons/ldapmanager/
/usr/share/gosa/plugins/addons/ldapmanager/class_csvimport.inc
/usr/share/gosa/plugins/addons/ldapmanager/class_export.inc
/usr/share/gosa/plugins/addons/ldapmanager/class_exportxls.inc
/usr/share/gosa/plugins/addons/ldapmanager/class_import.inc
/usr/share/gosa/plugins/addons/ldapmanager/class_ldif.inc
/usr/share/gosa/plugins/addons/ldapmanager/contentcsv.tpl
/usr/share/gosa/plugins/addons/ldapmanager/contentexport.tpl
/usr/share/gosa/plugins/addons/ldapmanager/contentexportxls.tpl
/usr/share/gosa/plugins/addons/ldapmanager/contentimport.tpl
/usr/share/gosa/plugins/addons/ldapmanager/main.inc
/usr/share/gosa/plugins/addons/ldapmanager/tabs_ldif.inc