fix conflict with openstack ironic puppet module
fix conflict with openstack ironic puppet module

force_power_state_during_sync was added to openstack
puppet-ironic.

https://github.com/openstack/puppet-ironic/blob/master/manifests/conductor.pp

As such we need to use the class variable so that we
do not have conflicts when installing the undercloud.

The RDO-manager core promote job is failing on this
conflict:

https://ci.centos.org/view/rdo/job/rdo_manager-promote-build-delorean-rdo-kilo

Change-Id: I6c0daf7da5cc74c4d415f900b26a2db65b09725e

dpkshetty/instack-undercloud,rdo-management/instack-undercloud,bcrochet/instack-undercloud,dmsimard/instack-undercloud,eprasad/instack-undercloud,dmsimard/instack-undercloud,dpkshetty/instack-undercloud,bcrochet/instack-undercloud,rdo-management/instack-undercloud,eprasad/instack-undercloud