[Trac #317] X authority file should be in tmpfs not jffs2

[Zarro Boogs per Child]

#317: X authority file should be in tmpfs not jffs2
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 Reporter:  dwmw2   |       Owner:  blizzard
     Type:  defect  |      Status:  new     
 Priority:  normal  |   Milestone:  BTest-1 
Component:  distro  |    Keywords:          
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 we put it in /home/olpc/.serverauth.$number but it should be somewhere
 volatile instead of on flash.

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Ticket URL: <http://dev.laptop.org/ticket/317>
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