[Merge] ~nteodosio/software-properties:threading into software-properties:ubuntu/master

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/software-properties:threading into software-properties:ubuntu/master.

Requested reviews:
  Sebastien Bacher (seb128)

For more details, see:
https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/434815

GLib.Thread is not available in Bionic and Focal: https://gitlab.gnome.org/GNOME/glib/-/issues/602.

Use Python threading module.

Also need to let daemonic threads go lest software-properties becomes uncloseable after invoking the UA attach dialog without subsequent verification of the PIN in the magic attach flow.

That, in my reading, is backed up by the definition of daemonic thread[1]:

> A thread can be flagged as a “daemon thread”. The significance of this flag is that the entire Python program exits when only daemon threads are left.

[1]: https://docs.python.org/3/library/threading.html
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