[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3023: Add some Eliot logging to immutable upload

[Tahoe-LAFS]

#3023: Add some Eliot logging to immutable upload
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  1.12.1
 Keywords:           |  Launchpad Bug:
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 As trying to understand the behavior around ticket:3022 I wanted to see
 some information about the immutable upload process and how it interacts
 with the servers-of-happiness share placement logic.

 So I added some Eliot logging.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3023>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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