Partial revert of bug/1372428 commit

There was no need to change default parameter in class definition
in I636125c7b4b092e108c584cc02c3d4177cc6a7c0

Changing parameter in class declaration in openstack::ceilometer
is enough.

Change-Id: Idcadfa1f213978193e82b15bb092e06f3aa3299f