Added functional test for object manifest

The Object manifest is way to support large objects.
http://docs.openstack.org/developer/swift/overview_large_objects.html.
This functional test upload a random data in to segments.
Create a manifest object to connect all these segments.
Issue a GET request to manifest object and match this data with the original unsegmented data.  

Change-Id: I4ca3f4b4e4540f3121c75db50280ef214836a8d1
Signed-off-by: Pushpesh Sharma <psharma@redhat.com>
Reviewed-on: http://review.gluster.org/5945
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>