[Bugs] #615 UNSP: shutdown/reboot/logout: don't require hald to be running

[SugarLabs Bugs]

#615: shutdown/reboot/logout: don't require hald to be running
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    Reporter:  sascha_silbe               |          Owner:  tomeu                      
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Currently all of shutdown, reboot and logout only work if hald is running
 (which is wasting precious resources on embedded systems).
 For shutdown and reboot, "sudo poweroff" and "sudo reboot" can be used.
 For logout, I don't know (yet) why it currently requires HAL at all.
 The HAL methods should probably be tried first (since sudo might not be
 configured correctly), with the above commands used as fallback.

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Ticket URL: <http://dev.sugarlabs.org/ticket/615>
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