[Merge] ~dbungert/livecd-rootfs:lp-2063192-more-drives into livecd-rootfs:ubuntu/master

[Nick Rosbrook]

It might make sense to use `ExecStopPost=`[1] instead of `ExecStop=` so that the cleanup happens on failure too. Otherwise, this looks like the correct service definition for replicating /usr/lib/udisks2/udisks2-inhibit.

[1] https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#ExecStopPost=
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https://code.launchpad.net/~dbungert/livecd-rootfs/+git/livecd-rootfs/+merge/464842
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