libssh2

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