[Bugs] #1137 UNSP: Check existence of wpa_passphrase before invoking

[SugarLabs Bugs]

#1137: Check existence of wpa_passphrase before invoking
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    Reporter:  alsroot                    |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 some distros use /usr/bin/wpa_passphrase instead of
 /usr/sbin/wpa_passphrase

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Ticket URL: <http://dev.sugarlabs.org/ticket/1137>
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