Zhang Wei 84dc009f41 refactor httpError() and add 404 "not found" mapping
When docker pull a non-existent repo, daemon will report "image xxx not found"
with an error code 500, which should be 404.
This commit add 404 "not found" mapping and refactor httpError function.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
Upstream-commit: ab42a3a23a1276ccad874a13cf8604cb59124e10
Component: engine
2015-04-23 19:37:47 +08:00
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