/usr/share/gosa/plugins/ is in gosa-plugin-gofon 2.7.4+reloaded2-13+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/admin/
/usr/share/gosa/plugins/admin/ogroups/
/usr/share/gosa/plugins/admin/ogroups/gofon/
/usr/share/gosa/plugins/admin/ogroups/gofon/class_phonequeue.inc
/usr/share/gosa/plugins/admin/ogroups/gofon/phonequeue.tpl
/usr/share/gosa/plugins/admin/systems/
/usr/share/gosa/plugins/admin/systems/gofon/
/usr/share/gosa/plugins/admin/systems/gofon/class_phoneGeneric.inc
/usr/share/gosa/plugins/admin/systems/gofon/paste_generic.tpl
/usr/share/gosa/plugins/admin/systems/gofon/phone.tpl
/usr/share/gosa/plugins/admin/systems/gofon/phonesettings.tpl
/usr/share/gosa/plugins/admin/systems/gofon/tabs_phone.inc
/usr/share/gosa/plugins/admin/systems/services/
/usr/share/gosa/plugins/admin/systems/services/gofon/
/usr/share/gosa/plugins/admin/systems/services/gofon/class_goFonServer.inc
/usr/share/gosa/plugins/admin/systems/services/gofon/goFonServer.tpl
/usr/share/gosa/plugins/gofon/
/usr/share/gosa/plugins/gofon/conference/
/usr/share/gosa/plugins/gofon/conference/class_phoneConferenceGeneric.inc
/usr/share/gosa/plugins/gofon/conference/class_phoneConferenceManagment.inc
/usr/share/gosa/plugins/gofon/conference/conf-filter.xml
/usr/share/gosa/plugins/gofon/conference/conf-list.tpl
/usr/share/gosa/plugins/gofon/conference/conf-list.xml
/usr/share/gosa/plugins/gofon/conference/generic.tpl
/usr/share/gosa/plugins/gofon/conference/main.inc
/usr/share/gosa/plugins/gofon/conference/paste_generic.tpl
/usr/share/gosa/plugins/gofon/conference/tabs_conference.inc
/usr/share/gosa/plugins/gofon/fonreports/
/usr/share/gosa/plugins/gofon/fonreports/class_fonreport.inc
/usr/share/gosa/plugins/gofon/fonreports/contents.tpl
/usr/share/gosa/plugins/gofon/fonreports/main.inc
/usr/share/gosa/plugins/gofon/macro/
/usr/share/gosa/plugins/gofon/macro/class_gofonMacro.inc
/usr/share/gosa/plugins/gofon/macro/class_gofonMacroManagement.inc
/usr/share/gosa/plugins/gofon/macro/class_gofonMacroParameters.inc
/usr/share/gosa/plugins/gofon/macro/generic.tpl
/usr/share/gosa/plugins/gofon/macro/macro-filter.xml
/usr/share/gosa/plugins/gofon/macro/macro-list.tpl
/usr/share/gosa/plugins/gofon/macro/macro-list.xml
/usr/share/gosa/plugins/gofon/macro/main.inc
/usr/share/gosa/plugins/gofon/macro/parameter.tpl
/usr/share/gosa/plugins/gofon/macro/paste_generic.tpl
/usr/share/gosa/plugins/gofon/macro/remove.tpl
/usr/share/gosa/plugins/gofon/macro/tabs_macros.inc
/usr/share/gosa/plugins/gofon/migration/
/usr/share/gosa/plugins/gofon/migration/class_migrate_phoneConferenceRDN.inc
/usr/share/gosa/plugins/gofon/migration/class_migrate_phoneMacroRDN.inc
/usr/share/gosa/plugins/gofon/migration/class_migrate_phoneRDN.inc
/usr/share/gosa/plugins/gofon/phoneaccount/
/usr/share/gosa/plugins/gofon/phoneaccount/class_phoneAccount.inc
/usr/share/gosa/plugins/gofon/phoneaccount/generic.tpl
/usr/share/gosa/plugins/gofon/phoneaccount/paste_generic.tpl