[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3014: Update raise syntax for python3 compatibility

[Tahoe-LAFS]

#3014: Update raise syntax for python3 compatibility
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     Reporter:  heartsucker  |      Owner:
         Type:  defect       |     Status:  new
     Priority:  normal       |  Milestone:  Support Python 3
    Component:  unknown      |    Version:
   Resolution:               |   Keywords:
Launchpad Bug:               |
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Comment (by heartsucker):

 PR: https://github.com/tahoe-lafs/tahoe-lafs/pull/588

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3014#comment:1>
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