[cli-ref] Update python-ceilometerclient to 2.4.0
[cli-ref] Update python-ceilometerclient to 2.4.0

Change-Id: I320a615e67e868157d9802b90aa972cfd4be04cb

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals