ipa-server-certinstall failing, unknown option realm
    
    The option realm was being passed in instead of realm_name.
    
    https://pagure.io/freeipa/issue/7489
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Alexey Slaykovsky <alexey@slaykovsky.com>