BZ #1099661 - remove unused ceilometer_host_param

https://bugzilla.redhat.com/show_bug.cgi?id=1099661

Fixes a bug caused by an unused parameter being passed into
compute_common.pp from either nova_network/compute.pp and
neutron/compute.pp.
Merge pull request #233 from cwolferh/bz1099661_rm_ceilometer_host_param_from_compute

BZ #1099661 - remove unused ceilometer_host_param