Resolves:  dogtagpki Pagure Issue #2735,2856,2861,2862,2874
    
    - Re-base Dogtag to 10.5.3
    - dogtagpki Pagure Issue #2735 - Secure removal of secret data storage
      (jmagne)
    - dogtagpki Pagure Issue #2856 - Pylint flags seobject failures
      (cheimes, mharmsen)
    - dogtagpki Pagure Issue #2861 -ExternalCA: Failures in ExternalCA when
      tried to setup with CMC signed certificates (cfu)
    - dogtagpki Pagure Issue #2862 - Create a mechanism to select the
      default NSS DB type (jmagne, mharmsen)
    - dogtagpki Pagure Issue #2874 - nuxwdog won't start on Fedora
      (alee, mharmsen)