Extend the listing possibility

Descriptive title for this enhancement

Hello,

With the new Ipam plugin I thought we could find some use to extend the listing possibility.

Example we have the following LDIF

cn=demo-dev,ou=servers,ou=systems
createTimestamp 	2020-04-09 20:29:00
modifyTimestamp 	2020-04-10 04:33:42
cn 	demo-dev
fdMode 	unlocked
objectClass 	fdServer
objectClass 	ipHost
objectClass 	ieee802Device
ipHostNumber 	192.168.10.25
ipHostNumber 	192.168.10.34
macAddress 	ff:ff:ff:ff:ff:fd
macAddress 	ff:ff:ff:ff:ff:fe

    cn=eth0
    createTimestamp 	2020-04-10 04:19:38
    modifyTimestamp 	2020-04-10 04:46:47
    objectClass 	fdNetworkInterface
    cn 	eth0
    macAddress 	ff:ff:ff:ff:ff:fe
    ipHostNumber 	192.168.10.25
    fdNetworkInterfaceVlanId 	42
    fdNetworkInterfaceVlanTag 	the_lvan
    fdNetworkInterfaceSubnetDN 	cn=test-192,ou=ipam,dc=demo-fusiondirectory,dc=org

    cn=eth1
    createTimestamp 	2020-04-10 04:33:15
    modifyTimestamp 	2020-04-10 04:33:15
    objectClass 	fdNetworkInterface
    cn 	eth1
    macAddress 	ff:ff:ff:ff:ff:fd
    fdNetworkInterfaceVlanTag 	234
    ipHostNumber 	192.168.10.34

    cn=eth2
    createTimestamp 	2020-04-10 04:56:11
    modifyTimestamp 	2020-04-10 04:56:11
    objectClass 	fdNetworkInterface
    cn 	eth2
    macAddress 	ff:ff:ff:ff:ff:fc
    fdNetworkInterfaceSubnetDN 	cn=test-192,ou=ipam,dc=demo-fusiondirectory,dc=org
    ipHostNumber 	192.168.1.1

We can only use attributs from the root object in the listing.

Actual behavior

Example, if I want the "cn" as Column it only show me "demo-dev"

Expected behavior

I would want to display the cn from eth1, so at first we need the possibility to search through sub objects and finaly a way to "filter" what we want.

Example show me the "cn" attribute for the objects with a dn that match my filter "cn=eth1" or something similar.

Step by step description of new behaviour

Adding attribute + filter to the listing
Test if we see the right element

Benefits

It will help making more complex listing information.

We could imagine something like showing only the IP of an interface or showing in one column the cn and another one the ip

Possible Drawbacks

none