Currently, a user with read/write access to a container (but without
access to creat new containers) recieves a warning every time they
upload. Now, allow them to avoid the extra request and warning by
specifying --skip-container-put on the command line.
This is also useful when testing: developers can HEAD a container to
ensure it's in memcache, shut down all container servers, then upload
and creaate a bunch of async pendings. Previously, the 503 on container
PUT would prevent the object upload from even being attempted.
Closes-Bug: 1317956
Related-Bug: 1204558
Change-Id: I3d9129a0b6b65c6c6187ae6af003b221afceef47
Related-Change: If1f8a02ee7459ea2158ffa6e958f67d299ec529e
f1858d89e0