Enable the proxy to fetch a shard container location from the container server in order to redirect an object update to the shard. Enable the container server to redirect object updates to shard containers. Enable object updater to accept redirection of an object update. Co-Authored-By: Matthew Oliver <matt@oliver.net.au> Co-Authored-By: Tim Burke <tim.burke@gmail.com> Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com> Change-Id: I6ff85827eecdea746b3626c0d401f68139cce19d