Update to 0.77.2
    
    - expose the certificate's not-valid-before and not-valid-after dates as a
      property over D-Bus (ticket #41)
    - give the local signer its own configuration option to set the lifetime
      of its signing certificate, falling back to the lifetime configured for
      the self-signer as a default to match the previous behavior
    - fix a potential read segfault parsing the output of an enrollment helper,
      introduced in 0.77 (thanks to Steve Neuharth)
    - read the ns-certtype extension value in certificates
    - request an enrollment certtype extension to CSRs if we have a profile name
      that we want to use (ticket #17, possibly part of IPA ticket #57)