Merge queue-reset branch to Asterisk

From a user point-of-view, this adds new CLI commands and Manager Actions to
better facilitate the reloading of queues and the resetting of their statistics.

The new CLI commands are the "queue reload" and "queue reset stats" commands.

The new manager actions are the QueueReload and QueueReset commands.

Review: http://reviewboard.digium.com/r/115



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@175663 65c4cc65-6c06-0410-ace0-fbb531ad65f3