The usage of module_defaults allows to reduce the size of the tests and
to have the needed information in the tasks only. The default values for the
parameters are automatically passed to the module by Ansible.

It is not possible to use a module group for module_defaults as this could
only be done with Ansible Collections. The tests are also used upstream and
downstream without a collection.

Without groups of a collection it is needed to add the defaults for all
modules separately.

Simple example:

    module_defaults:
      ipahost:
        ipaadmin_password: SomeADMINpassword
        ipaapi_context: "{{ ipa_context | default(omit) }}"

Several module example using YAML anchors and aliases:

    module_defaults:
      ipahost: &ipa_module_defaults
        ipaadmin_password: SomeADMINpassword
        ipaapi_context: "{{ ipa_context | default(omit) }}"
      ipauser: *ipa_module_defaults
      ipagroup: *ipa_module_defaults