Update kea to version 2.2.0 / rev 11 via SR 1043790
    
    https://build.opensuse.org/request/show/1043790
    by user jengelh + dimstar_suse
    - Remove following packages from BuildRequires
      * docbook-xsl-stylesheets
      * elinks
      * libxslt-tools
    
    AFAICT these packages aren't needed for generating the docs and the official documentation doesn't mention them as requirements. Especially elinks would be nice to remove as it isn't available in Leap/SLE. If there is a reason these are required feel free to decline this request. (forwarded request 1043789 from jcronenberg)