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

[Yu Ning]

I tried again, this time I managed to cherry pick some patches from debian git tree, and in my own test usb-creator can erase the usb stick successfully. However I can't promise the patchset I selected is complete, since there are too many antecedent and subsequent changes related. Could you help to review it? Thanks in advance.

https://code.launchpad.net/~yuningdodo/ubuntu/trusty/util-linux/util-linux.backport-wipefs-partition-table-erasing-support/+merge/237898
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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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