Remove ceilometer-zvm entry
Remove ceilometer-zvm entry

As part of dropping py27 job, openstack-python3-ussuri-jobs
has been added to ceilomter-zvm .zuul.yaml file:

https://review.opendev.org/c/x/ceilometer-zvm/+/763635

Removing the ceilometer-zvm entry in zuul.d/projects.yaml
as it is no longer needed anymore.

Change-Id: I9a4f8e34d0edb61fed3a80fa8aa99bbdc08c2ccd

openstack-infra/project-config,openstack-infra/project-config