cloudkitty-processor service error[1] when using ceilometer collector.
Because the ceilometer collector has been removed in cloudkitty repo[2].

[1]http://logs.openstack.org/21/555121/1/check/puppet-openstack-beaker-centos-7/404b6ea/logs/cloudkitty/processor.txt.gz#_2018-03-22_04_39_53_481
[2]https://review.openstack.org/#/c/548630/

Change-Id: I414b63e9e943068e712818d2937390b9cdbfdcc0
Closes-Bug: #1757946