[Bugs] #1440 UNSP: sugar-emulator: kill X server on exit

[Sugar Labs Bugs]

#1440: sugar-emulator: kill X server on exit
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Assigned         
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 If sugar aborts abnormally, the X server might keep running, so we should
 kill it off after sugar returns.

 With this patch, all processes were terminated properly during a small
 test run (without setting anything up to explicitly kill any process
 except the X server). So we might consider including it in 0.86.1.
 This obviously doesn't fix all occurences of #1257, but at least some.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1440>
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