Remove openstack-ceilometer-expirer check

Remove openstack-ceilometer-expirer check

This wont work as openstack-ceilometer-expirer
cant be listed from systemctl.

Also we are not runing any upgrade task.

i.e.:
[root@overcloud-controller-0 ceilometer]# systemctl list-units | grep ceilometer
  openstack-ceilometer-api.service           loaded active running   OpenStack ceilometer API service
  openstack-ceilometer-central.service       loaded active running   OpenStack ceilometer central agent
  openstack-ceilometer-collector.service     loaded active running   OpenStack ceilometer collection service
  openstack-ceilometer-notification.service  loaded active running   OpenStack ceilometer notification agent

Change-Id: Ia9f7d3744264af1a37c06b9c8878cd95bed4e1c5