[Merge] lp:~khurshid-alam/unity-settings-daemon/fix-low-battery-notifications into lp:unity-settings-daemon

[Sebastien Bacher]

Review: Approve

Thanks, looks fine. One comment, it would help if you included reference to upstream commits when it's a backport, e.g in this case seems to be
https://gitlab.gnome.org/GNOME/gnome-settings-daemon/commit/88e384e3
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https://code.launchpad.net/~khurshid-alam/unity-settings-daemon/fix-low-battery-notifications/+merge/369223
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