controller/ha: disable keystone-manage bootstrap.
controller/ha: disable keystone-manage bootstrap.

Because Overcloud Keystone resources are not managed by puppet-keystone
but by os-cloud-config, we need to let os-cloud-config managing keystone
bootstrap otherwise the Exec will fail since some data is already in
place.

Later, when Keystone resources will be managed by Puppet, drop this
parameter, because puppet-keystone is able to manage the boostrap
itself.

Change-Id: I027deaae5cf90c27a6b5e9d236ae61145cab3c3f
Closes-Bug: #1551501

bcrochet/tripleo-heat-templates,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht,openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/opnfv-tht,trozet/opnfv-tht