[Merge] lp:~zhangew401/usensord/fix-lp-1433590 into lp:usensord

[Zhang Enwei]

Thank you so much for suggestions, Tyler.
Sorry I don't quite understand "I'd much prefer that you confine maliit-server with an AppArmor profile", do you mean we need to change the AppArmor profile of maliit-server?

I will address your mentioned issues at least at the time.
Thank you.
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https://code.launchpad.net/~zhangew401/usensord/fix-lp-1433590/+merge/299959
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