key presses aren't passed through to ansible process

[snopoke]

When running a playbook that uses async tasks (like setup_pg_standby.yml any key presses aren't passed through to the ansible process.

For example when waiting for a task to complete the user is prompted:

TASK [pause] *******************************************************************
Pausing for 300 seconds
(ctrl+C then 'C' = continue early, ctrl+C then 'A' = abort)

Pressing ctrl+C at this point will terminate the process completely:

Traceback (most recent call last):
  File "/home/skelly/.virtualenvs/ansible/bin/cchq", line 11, in <module>
    load_entry_point('commcare-cloud', 'console_scripts', 'cchq')()
  File "/home/skelly/commcare-cloud/src/commcare_cloud/commcare_cloud.py", line 158, in main
    exit_code = commands[args.command].run(args, unknown_args)
  File "/home/skelly/commcare-cloud/src/commcare_cloud/commands/ansible/ansible_playbook.py", line 128, in run
    return run_action_with_check_mode(run_check, run_apply, args.skip_check, args.quiet, always_skip_check)
  File "/home/skelly/commcare-cloud/src/commcare_cloud/commands/ansible/helpers.py", line 117, in run_action_with_check_mode
    exit_code = run_apply()
  File "/home/skelly/commcare-cloud/src/commcare_cloud/commands/ansible/ansible_playbook.py", line 126, in run_apply
    return ansible_playbook(environment, args.playbook, *unknown_args)
  File "/home/skelly/commcare-cloud/src/commcare_cloud/commands/ansible/ansible_playbook.py", line 117, in ansible_playbook
    p.communicate(input='{}\n'.format(environment.get_ansible_vault_password()))
  File "/usr/lib/python2.7/subprocess.py", line 796, in communicate
    self.wait()
  File "/usr/lib/python2.7/subprocess.py", line 1376, in wait
    pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
  File "/usr/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call
    return func(*args)
KeyboardInterrupt
 [ERROR]: User interrupted execution