[Feature Request] Async commands should return command sequence numbers

[rpcope1]

Nacho,

One things that would be helpful would be if for each async command, we were returned the sequence number used to send the command. While I can't build my callback functions directly with the sequence number now (perhaps you could add a function to get the next possible sequence number), I could add each sequence number into a queue, and pop numbers off as messages are received. If I had a command fail to come back, it should be pretty straightforward for the user to build up the framework to figure this our relatively quickly.

Example:

 my_queue = Queue.Queue()
 client = kinetic.ThreadedClient('192.168.128.10')
 for I in xrange(100):
    #blah blah blah build up callback handlers with keys and values
    seq_num = client.putAsync(key, value, success_handler(my_queue, i), failure_handler(my_queue, i))
    my_queue.put((seq_num, i))
 #Watch for callbacks to come back, if something fails, track it back to individual sequence number.```

[icorderi]

You already solved your need in your own example.

client.putAsync(key, value, success_handler(my_queue, i),failure_handler(my_queue, i))
my_queue[i] = "some state"

You don't need the clients internal sequence number.

[rpcope1]

For doing debug, especially against the drive, I think it would be good to have the ability to explicitly expose the sequence numbers. I also think the development team agrees with this, as it allows you to look inside the drive or simulator and match up requests on the drive/simulator to requests at the client level.