Fixes list of requirements
Fixes list of requirements

Please see the following link for more detailed information:
https://github.com/openstack/requirements/blob/master/global-requirements.txt

Change-Id: I2fae60646c56f29d4d8238356553b667b787f6cc

openstack/mistral,StackStorm/mistral,StackStorm/mistral,openstack/mistral,dennybaa/mistral,dennybaa/mistral