2.0.0-0.1.rc4 - Update for new upstream tarball
    
    ...for release candidate: Pacemaker-2.0.0-rc4,
      for full details, see included ChangeLog file or
      https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-2.0.0-rc4
    . as a special note, previous release candidate, rc3, had rolling upgrades
      broken, and if that is required, that particular release shall be
      skipped in the upgrade path altogether
    
    Adapt spec file more akin to upstream version including:
    . as part of the update process, possibly move old log files as implicitly
      used prior to 2.0 so there's a (limited) continuity with the new implicit
      location, preventing clutter and confusion (ce2e74c99, 765eb3f24)
    . move cts-exec-helper from -cli under main package (a2dc2a67e)
    . -cts backed with new helpers and, tangentially, dummy systemd service
      file transiently generated on-demand again (fa2d43445, d52b001b1)
    
    Signed-off-by: Jan Pokorný <jpokorny@redhat.com>