I have fixes here: https://github.com/openshift/openshift-ansible/pull/4787
Verify this bug with openshift-ansible-3.6.165-1.git.0.fd7125e.el7.noarch.rpm ocp-3.6 installation on aws with cloudprovider enabled was successful.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2017:1716