Simplify object path when reporting SLO put errors

When reporting errors for SLO PUT requests, use the object path from the
manifest without the '/vrs/account' prefix. This is a continuation of
the same changes made for SLO/bulk delete requests in 6768d5b.

Change-Id: I40c90cccc1b7b5303d9f2b084dccb3be4f4448d8
Pool memcache connections

This creates a pool to each memcache server so that connections will not
grow without bound.  This also adds a proxy config
"max_memcache_connections" which can control how many connections are
available in the pool.

A side effect of the change is that we had to change the memcache calls
that used noreply, and instead wait for the result of the request.
Leaving with noreply could cause a race condition (specifically in
account auto create), due to one request calling `memcache.del(key)` and
then `memcache.get(key)` with a different pooled connection.  If the
delete didn't complete fast enough, the get would return the old value
before it was deleted, and thus believe that the account was not
autocreated.

ClaysMindExploded
DocImpact
Change-Id: I350720b7bba29e1453894d3d4105ac1ea232595b
Allow slightly older dnspython (>= 1.9.4).

This has a couple benefits.

First, it means Ubuntu Precise users can just install python-dnspython
from packages instead of having to pull one in from source. This
should also fix an install error with new SAIO boxes where running
"python setup.py develop" fails unless a satisfactory dnspython is
already installed.

Second, it matches the dnspython dependency in the global
requirements. This means that the gates are already running with this
dnspython dependency, and it means our requirements.txt is one step
closer to being a subset of the global requirements.txt, which is
important to some people.

Change-Id: I5d58f488e1e4c4139c9fb20d89f386cab1537e98
Add "note" box callouts to SAIO for user changes.

The SAIO is purpously cut into two parts, so that you don't have to switch
back and forth between root and your unprivledged user.  Add some "note" box
callouts to highlight this changeover.

Change-Id: I8b1a8f0539eac60d4121bdd4dab01df75ecca207
Merge "Pool memcache connections"
Merge "Allow slightly older dnspython (>= 1.9.4)."
Merge "Simplify object path when reporting SLO put errors"
Merge "Add "note" box callouts to SAIO for user changes."