[Bugs] #2082 UNSP: mesh icons duplicated on suspend/resume

[Sugar Labs Bugs]

#2082: mesh icons duplicated on suspend/resume
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    Reporter:  dsd                        |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  r?                         
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Three or more mesh icons were being added after every suspend/resume.

 There was already code present to detect when the device goes away and
 remove the icons, but it was not working. NetworkManagerObserver was
 attempting to look at the properties of the gone-away device in order to
 see if it is a mesh device, but this was failing because the device has
 already been destroyed at this point.

 Solve this by recording the device path of the mesh device when it is
 detected, so that we can later determine if the gone-away device is the
 mesh device.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2082>
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