This is now common functionality in an ansible role, rather than
being implemented directly in openstack-ansible service roles.
This patch creates the apache server certificate and key using the
pki role when keystone_ssl is true.
A CA certificate and key are generated and installed when keystone
is configured to be an IDP, triggered by keystone_idp.certfile being
defined.
Depends-On: https://review.opendev.org/c/openstack/ansible-role-pki/+/830794
Change-Id: Ie70aecc93b8acb7c1bbad02e98254b7c50c4c86f