[Merge] lp:~yuningdodo/ubuntu/trusty/util-linux/util-linux.backport-utopic-2.25-8ubuntu1 into lp:ubuntu/trusty-updates/util-linux

[Yu Ning]

Colin, Adam, thanks very much for your review.

udisks2 uses wipefs to erase the partition table, however wipefs doesn't support this feature in trusty. Should we modify udisks2 to use some other way to do the job? For GPT we could use "sgdisk --zap-all", for DOS maybe we could use "dd". Do you think that's an acceptable way for the related issues?
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https://code.launchpad.net/~yuningdodo/ubuntu/trusty/util-linux/util-linux.backport-utopic-2.25-8ubuntu1/+merge/232848
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