Validate file contents which are located at extracted dir

Validate file contents which are located at extracted dir

When the package mount installed, some contents of package will be
extracted at package directory, because someone needs those files
without mounting zip file.
The test needs to validate those files recovered or rollbacked well or not.

Change-Id: Id72749b4cf5852f22bec30eaf3b52c157e13bc5d
Signed-off-by: Sangyoon Jang <jeremy.jang@samsung.com>