ipaservice: Updated and new tests for certificates and multi service handling

The tests test_services_absent.yml, test_services_present.yml and
test_services_present_slice.yml have been updated to use in memory data
for testing instead of loading json files. This made is simpler to use
variables from the playbook for example for fqdn host names.

New tests for certificates with and without trailing new lines have been
added for single service and multiple service handling.