[Bugs] #1296 UNSP: close collaboration tube after the activity window is destroyed

[SugarLabs Bugs]

#1296: close collaboration tube after the activity window is destroyed
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    Reporter:  tomeu                      |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Unspecified                
    Severity:  Unspecified                |     Resolution:                             
    Keywords:                             |   Distribution:  Unspecified                
Status_field:  Unconfirmed                |  
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Comment(by tomeu):

 This is needed so Write can migrate the session from the initiator to
 other participant. Please comment and tell if you see any negative
 consequence from this.

 May be worth backporting to 0.84.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1296#comment:1>
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