Added optional max_containers_per_account restriction. If set to a
positive value and if a client tries to perform a container PUT when
at or above the max_containers_per_acount cap, a 403 Forbidden will
be returned with an explanatory message.
This only restricts the proxy server, not any of the background
processes that might need to create containers (replication, for
instance). Also, the container count is cached for the proxy's
recheck_account_existence number of seconds. For these reasons, a
given account could exceed this cap before the 403 Forbidden
responses kick in and therefore this feature should be considered a
"soft" limit.
You may also add accounts to the proxy's max_containers_whitelist
setting to have accounts that ignore this cap.
Change-Id: I74e8fb152de5e78d070ed30006ad4e53f82c8376
2c6de2ae52