With ansible-2.13 it is required to use jinja for list concatenation.

  list: "[] + ['a'] + ['b']"

needs to become

  list: "{{ [] + ['a'] + ['b'] }}"

copy_external_cert.yml needed to be changed.

Currently the certifaictes are copied ot the server with the complete
path that is provided within the playbook. This could result in
unexpected file placements. Certificates should be placed in the /root
folder for the deployment.

Fixes #405 (copy_external_cert does not handle pathed items)

This adds support for the --external-ca option to ipaserver. Lots of
additional tests and checks from ServerInstallInterface.__init__ have
been added to ipaserver_test. Also duplicate tests cna checks have been
removed.

Installer settings in ansible_ipa_server module_util are now also set
to the defaults that are used in Installable, ServerInstallInterface,
ServerMasterInstall, ADTrustInstallInterface and Uninstall.

The /root/ipa.csr file generated on the node in ca.install_step_0 will
be copied to the controller as "{{ inventory_hostname }}-ipa.csr".

The new task file copy_external_cert.yml has been added to copy the
generated certificate defined in ipaserver_external_cert_files to the node
to continue with ca.install_step_1.

The tasks/install.yml file has been adapted to make sure that the steps
that will be done in step two will be skipped after step one has been
done.