Failed to execute 'dockerswarm' workload

Description
===========
There are some issues when executing workload 'dockerswarm' as below:
* Can not ssh to swarm node
* Need to print 'yes' manually three times
The authenticity of host '172.23.28.153 (172.23.28.153)' can't be established.
ECDSA key fingerprint is 64:5f:5b:c2:7e:c2:78:0c:33:9e:ab:ce:43:32:51:96.
Are you sure you want to continue connecting (yes/no)?

Steps to reproduce
==================
* Clone the latest source
git clone https://github.com/openstack/interop-workloads.git in-wo-m
* Create my cloud's vars file
* Execute ansible-playbook
ansible-playbook -e "action=apply env=inspur password=interop" site.yml

Expected result
===============
SUCCESS

Actual result
=============
Failure

Environment
===========
1. interop-workloads version
# git log
commit fa360ae63c171fc8ce2cc270099fff3e60bc5ae7
Author: Daniel Mellado <email address hidden>
Date: Wed Feb 8 16:46:22 2017 +0100

    Add specs to documentation

    This commit adds a spec folder within documentation. This would be
    moved under its own project if it starts growing big enough.

    Change-Id: I54b8402b35ff72577f1b949d9a081752cb08a13b

2. Which workload did you use?
dockerswarm

Logs
===========
* The authenticity of host '172.23.28.153 (172.23.28.153)' can't be established.
ECDSA key fingerprint is 64:5f:5b:c2:7e:c2:78:0c:33:9e:ab:ce:43:32:51:96.
Are you sure you want to continue connecting (yes/no)?

* "scp -r \"/tmp/inspur/172.23.28.204/keys\" \"core@172.23.28.204:/home/core\"", "delta": "0:00:00.068040", "end": "2017-02-21 08:33:07.106947", "failed": true, "rc": 1, "start": "2017-02-21 08:33:07.038907", "stderr": "ssh: connect to host 172.23.28.204 port 22: Connection refused