object-storage: rebase Swift to 1.8.0 (grizzly)

Change-Id: I24265c12a45eac4cec761748096118c9647440be
BUG: 948039
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/4779
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>