certmonger: use long options when invoking dogtag-ipa-renew-agent
    
    To aid reader comprehension, use long options instead of short
    options when invoking dogtag-ipa-renew-agent.
    
      -N -> --force-new
      -O -> --approval-option
    
    Part of: https://pagure.io/freeipa/issue/7991
    
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>