#3358 BLOC Trial-3: manifest and upgradable images

[Zarro Boogs per Child]

#3358: manifest and upgradable images
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 Reporter:  cscott    |       Owner:  cscott 
     Type:  defect    |      Status:  new    
 Priority:  blocker   |   Milestone:  Trial-3
Component:  security  |     Version:         
 Keywords:            |    Verified:  0      
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 pilgrim should generate a signed manifest for builds, and the jffs images
 should be upgradable.

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Ticket URL: <https://dev.laptop.org/ticket/3358>
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