Some tests were missing from nightly definition:
test_external_ca.py::TestExternalCAdirsrvStop
test_external_ca.py::TestExternalCAInvalidCert
test_external_ca.py::TestMultipleExternalCA
Related to https://pagure.io/freeipa/issue/7743
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>