Standardize passwords used in tests and examples.

playbooks/service/service-host-is-absent.yml

playbooks/service/service-host-is-present.yml

playbooks/service/service-is-absent.yml

playbooks/service/service-is-disabled.yml

playbooks/service/service-is-present-with-all-attributes.yml

playbooks/service/service-is-present-with-host-force.yml

playbooks/service/service-is-present-without-host-object.yml

playbooks/service/service-is-present.yml

...oks/service/service-member-allow_create_keytab-absent.yml

...ks/service/service-member-allow_create_keytab-present.yml

...s/service/service-member-allow_retrieve_keytab-absent.yml

.../service/service-member-allow_retrieve_keytab-present.yml

playbooks/service/service-member-certificate-absent.yml

playbooks/service/service-member-certificate-present.yml

playbooks/service/service-member-principal-absent.yml

playbooks/service/service-member-principal-present.yml