Hu Keping edb661c0bf Remove leading spaces of username when login
When we run `docker login` we will be asked to input our username.

Prior to this PR, "userA" and " userA" will be considered as two
diferrent user, which is not right.

Signed-off-by: Hu Keping <hukeping@huawei.com>
Upstream-commit: 2687502ba4e3d3eb41b6da6b52de151ef5dca9a2
Component: engine
2015-03-10 07:54:08 +08:00
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