[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3486: Delegate responsibility for figuring out local network configuration to `netifaces`

[Tahoe-LAFS]

#3486: Delegate responsibility for figuring out local network configuration to
`netifaces`
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:  exarkun
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 `allmydata.util.iputil` has a lot of code for trying to figure out what
 network addresses are locally assigned.  This involves finding and running
 various child processes and scraping information from their output.

 This code is somewhat complex and unnecessarily slow (due to launching new
 processes).  It also fails if it cannot find any of these external
 helpers.

 The well-established `netifaces` Python package provides the same
 functionality behind a much simpler interface.

 Replace the current complex code with something simpler using `netifaces`.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3486>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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