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

[Sugar Labs Bugs]

#1317: check for Rainbow binaries before trying to use them
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  defect                     |         Status:  accepted         
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar-presence-service     |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  Assigned         
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Changes (by sascha_silbe):

  * keywords:  r! => r?


Comment:

 Timed on my XO-1 running from nfs-root (most likely slower than running
 from the internal NAND):

 1262959135.648757 DEBUG root: pre rainbow check: 1262959135.648518
 1262959135.774819 DEBUG root: post rainbow check: 1262959135.774293

 I.e. about 130ms for the entire check (first run).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1317#comment:14>
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