Update clustershell to version 1.9.2 / rev 11 via SR 1114717
    
    https://build.opensuse.org/request/show/1114717
    by user sthiell + anag+factory
    - Update to upstream release 1.9.2:
      * clush/clubak: fix line buffering with Python 3
      * clush: fix --[r]copy dest when --dest is omitted
      * NodeUtils: allow null values in cluster.yaml
      * Topology: check that node groups/wildcards are non-empty
      * packaging: fix missing xcat.conf.example