object-storage: rebase Swift to 1.8.0 (grizzly)

Merged (git cherry-pick) from master/HEAD to release-3.4

Change-Id: I24265c12a45eac4cec761748096118c9647440be
BUG: 948041
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/4780
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>