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.

(cherry picked from commit a56bf4411e2a64d39b6958335438a72b35e40fcb)