Add cases for Swift scenario test
Add cases for Swift scenario test

Based on current implement, we have already implemented the
basic ops of swift. However, as a object storage service,
object download and verification are key function of it. So
this patch is aim to enhance that to get a complete end to end
function flow.

Change-Id: Id0bdcd2105ad90ea1500c7cbd1acdbe19e5aa361

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