dd58a70 Fix and extend pki config override test

Authored and Committed by cheimes 5 years ago
    Fix and extend pki config override test
    
    * override ipa_ca_key_size
    * test with SHA512withRSA
    
    Related: https://pagure.io/freeipa/issue/5608
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>