gevent

Is your feature request related to a problem? Please describe.
Would like to be able to use callback function for run_command to call when a command has finished executing.

Describe the solution you'd like

def my_cb(host_out, my_arg):
    for line in host_out.stdout:
        print(line)

client.run_command('echo me', callback=my_cb, callback_extra_args=('my_arg',))

`m

There is legacy API right now that generally works, but there should be a better versioned API for the server, that utilizes HTTP verbs better, we probably should revamp some configuration keys and response formats too.