Open Stack

This change:

https://review.openstack.org/#/c/32919/

is the final piece of a puzzle that allows a (potentially significant)
performance improvement for image uploads (snapshots)/downloads when
using ssl.

Its the last change required for the following paths:

(nova/cinder) -> (glance client) -> (glance) -> (swift client) -> (swift)

Without this patch swift will be a bottleneck running at ~17 MB/s while
the other parts can potentially reach ~100 MB/s.

Risk: Currently the patch sets compression to be disabled by default
(giving better performance), but the old behaviour can be reverted
by setting the relevant config parameter. (We could even potentially
consider defaulting to the old behaviour.)

The patch was originally uploaded on Jun 13.

-Stuart