Fix root tag of response body for Upload Part Copy requests.
Correct body is following.
<?xml version="1.0" encoding="UTF-8"?>
<CopyPartResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<LastModified>2015-01-16T07:42:41.000Z</LastModified>
<ETag>"dd0591c4f082a4b1b57ea779a1566a28"</ETag>
</CopyPartResult>
Change-Id: I69801c50670c576485a9f0f5c12e578c1c433374
1a0253638f