[Systems] Remove slave nameservers

[Bernie Innocenti]

Hello,

now that we have 3 stable nameservers of our own, we may dismiss the
slaves provided by OSU-OSL for all our domains:

  sugarlabs.org
  sugarlabs.net
  somosazucar.org
  somosazucar.net
  somosazucar.com
  pustakalaya.org
  olenepal.org

Thank you very much for providing this service to us.

-- 
   // Bernie Innocenti - http://codewiz.org/
 \X/  Sugar Labs       - http://sugarlabs.org/