Before this callcenter_config queue reload [queuename] only reloads the queue
parameters and now it'll include a CC-Queue header with the queuename when using
mod_xml_curl and request a new config for updating agents and tiers related to the
queue.

If you are using mod_xml_curl please make sure to return the raw xml config file
with all the settings, queues, agents and tiers tags when we request the config
without a CC-Queue specified. If this header is present you can build the xml with
items only related to the queue requested.