Hu Keping a5107b7eb0 Format the output of docker history
Once there have '\t' in the "CREATED BY" section, it will possibly
cause a messy output of docker history.

Signed-off-by: Hu Keping <hukeping@huawei.com>
Upstream-commit: 6353f3a7b58fe7ef1cb33660003c1d7205f2e6c0
Component: engine
2015-09-22 21:27:20 +08:00
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