dcaegen2.deployments.bootstrap container fails to start.

$ docker logs boot

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Collecting enum34>=1.0.4; python_version == "2.7" or python_version == "2.6" or python_version == "3.3" (from oslo.config>=1.11.0->python-keystoneclient==1.6.0->cloudify-openstack-plugin==1.4)
Downloading https://files.pythonhosted.org/packages/c5/db/e56e6b4bbac7c4a06de1c50de6fe1ef3810018ae11732a50f15f62c7d050/enum34-1.1.6-py2-none-any.whl
Collecting PyYAML>=3.12 (from oslo.config>=1.11.0->python-keystoneclient==1.6.0->cloudify-openstack-plugin==1.4)
Downloading https://files.pythonhosted.org/packages/4a/85/db5a2df477072b2902b0eb892feb37d88ac635d36245a72a6a69b23b383a/PyYAML-3.12.tar.gz (253kB)
Collecting rfc3986>=0.3.1 (from oslo.config>=1.11.0->python-keystoneclient==1.6.0->cloudify-openstack-plugin==1.4)
Downloading https://files.pythonhosted.org/packages/01/2f/dc440bae2b6a185654b5c298f5cc7b172267db692bc24923130262caedac/rfc3986-1.1.0-py2.py3-none-any.whl
Collecting cmd2>=0.6.7 (from cliff>=1.10.0->python-neutronclient==2.6.0->cloudify-openstack-plugin==1.4)
Downloading https://files.pythonhosted.org/packages/07/4a/f8c16175fa806b9c81f60688411b09a84a23decf774f2cdd5657e43dfe9b/cmd2-0.9.0.post1.tar.gz (136kB)
cmd2 requires Python '>=3.4' but the running Python is 2.7.12
You are using pip version 9.0.3, however version 10.0.1 is available.

The problem is cmd2 default version in cloudify openstack plugin installation.

The latest docker image worked yesterday/ but the same image won't run today. I compare logs and the difference is cmd2 version. yesterday it was :

Collecting cmd2>=0.6.7 (from cliff>=1.10.0->python-neutronclient==2.6.0->cloudify-openstack-plugin==1.4)
Downloading https://files.pythonhosted.org/packages/88/1e/250cb2718e6c1b33713ea46526df24156e8e51c9494b549da196dfbcf9a9/cmd2-0.8.6-py2.py3-none-any.whl (51kB)

and it worked fine. I tried and download other branches of Cloudify OpenStack Plugins but no luck.

Please help me! I got stuck and I have no clue what should I do?