[Merge] lp:~thomas-voss/trust-store/fix-1504022 into lp:trust-store

[Tyler Hicks]

Thomas, I'm not sure that you need to add a user ID check. I was just curious what UID the code was expected to be running in. I'm happy enough with your answer that it runs as the user.

If you think the XDG code will be reused in other projects, it'd be good to package up separately.
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https://code.launchpad.net/~thomas-voss/trust-store/fix-1504022/+merge/278224
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