Revert "Move CA cert injection to host_prep_tasks"
Revert "Move CA cert injection to host_prep_tasks"

This reverts commit 8e5d5283cc466b07616a57eeeee28859300022ab.

Reason for revert: broke OVB periodic jobs
Closes-Bug: #1908976

Change-Id: I9e8c2c96706e9abf9739b8a857231f522542fa5f

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates