[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3307: refactor: centralize helper for "remove comments"

[Tahoe-LAFS]

#3307: refactor: centralize helper for "remove comments"
-------------------------+----------------------------
 Reporter:  meejah       |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  eventually
Component:  code         |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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 See https://github.com/tahoe-lafs/tahoe-
 lafs/pull/669#discussion_r363938582

 There are multiple places where tahoe code wants to iterate the lines of a
 file, but without commented-lines. A central helper would be good for
 this.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3307>
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