Container PUT requests and max container per account

If container counter per account is equal or greater than
max_container_per_account, then all PUT requests are failed and
403 is returned.
This is correct behaviour if the request is to create a new
container, however if container already exists PUT should be
allowed, even the max_container_per_account condition has met.

This patch allows to process PUT requests for existing containers,
even if max_container_per_account > = container count.

It indirectly resolve the bug 1306711, since swift-client
uses internally PUT requests for container, prior it upload an
object there.

Change-Id: I2dcf20b6feb27e346111466a565695eba4b4b1da
Merge "Container PUT requests and max container per account"