[Bugs] #1317 UNSP: check for Rainbow binaries before trying to use them

[SugarLabs Bugs]

#1317: check for Rainbow binaries before trying to use them
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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:  Unspecified                |     Resolution:                   
    Keywords:  r?                         |   Distribution:  Unspecified      
Status_field:  Assigned                   |  
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Changes (by sascha_silbe):

  * keywords:  => r?


Comment:

 I've tested this patch with
 a) Rainbow never installed (neither rainbow-run nor /etc/olpc-security
 exist)
 b) Rainbow active (both exist)
 c) Rainbow inactive (rainbow-run exists, but not /etc/olpc-security)
 d) Rainbow never installed, but /etc/olpc-security exists

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Ticket URL: <http://dev.sugarlabs.org/ticket/1317#comment:1>
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