[Bugs] #1673 UNSP: discard network history does nothing

[Sugar Labs Bugs]

#1673: discard network history does nothing
------------------------------------------+---------------------------------
    Reporter:  quozl                      |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Minor                      |       Keywords:  r?                         
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 clear_networks() in extensions/cpsection/network/model.py looks like this:

 {{{
 def clear_networks():
     """Clear saved passwords and network configurations.
     """
     pass
 }}}

 ideally this should clear the contents of nm/connections.cfg which is
 maintained by src/jarabe/model/network.py

 is a contributing cause of previous workaround failure on
 [http://dev.laptop.org/ticket/9977 dev.laptop.org 9977] (AP association
 failure after removing encryption).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1673>
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