
Use io.StringIO to replace StringIO.StringIO, and use unicode as StringIO() can only handle unicode strings. Story: 2003429 Task: 24618 Change-Id: Ie2ced7bba00d11b1698422cbe495abc0fbab7637 Signed-off-by: chenyan <yan.chen@intel.com> Signed-off-by: Sun Austin <austin.sun@intel.com>