Zhang Wei 62a856e912 Assert error in body of function inspectField* ...

1. Replace raw `docker inspect -f xxx` with `inspectField`, to make code
cleaner and more consistent
2. assert the error in function `inspectField*` so we don't need to
assert the return value of it every time, this will make inspect easier.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>

2016-01-29 23:39:07 +08:00

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