Distributed version

* Add -l log publish results option
* Add options -c publish confirms,-u user, -p pass,
  -n AMQP nodes
* Make publish multi-threaded

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Distributed multithreaded version

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>