/usr/share/gosa/plugins/ is in gosa-plugin-dhcp 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/systems/
/usr/share/gosa/plugins/admin/systems/services/
/usr/share/gosa/plugins/admin/systems/services/dhcp/
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpAdvanced.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpClass.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpDnsZone.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpGroup.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpHost.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpNetwork.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpNewSectionDialog.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpOption.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpPlugin.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpPool.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpService.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpSharedNetwork.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpSubClass.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpSubnet.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_dhcpTSigKey.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/class_servDHCP.inc
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcpNewSection.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_advanced.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_dnszone.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_group.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_host.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_network.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_pool.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_service.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_sharedNetwork.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_subnet.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/dhcp_tsigkey.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/remove_dhcp.tpl
/usr/share/gosa/plugins/admin/systems/services/dhcp/servdhcp.tpl