2.0.0-0.1.rc6 - Update for new upstream tarball
    
    ...for release candidate: Pacemaker-2.0.0-rc6,
      for full details, see included ChangeLog file or
      https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-2.0.0-rc6
    
    Adapt spec file more akin to upstream version including:
    . new procps-ng and psmisc dependencies with -cli and -cts, for e.g.
      "ps/sysctl/uptime" and "killall" invocations, respectively (a4ad8183a)
    . move crm_node to -cli (a94a1ed58)
    
    Signed-off-by: Jan Pokorný <jpokorny@redhat.com>