Description of problem:
This error repeats a lot in /var/log/mistral/engine.log:
2017-09-24 22:00:05.111 29298 INFO workflow_trace [-] Action 'tripleo.logging_to_swift.publish_ui_log_to_swift' (35a1eac5-336f-443c-bb6b-d6d4135948cb)(task=upload_to_swift) [RUNNING -> ERROR, error = Failed to run action [action_ex_id=35a1eac5-336f-443c-bb6b-d6d4135948cb, action_cls='<class 'mistral...]
Version-Release number of selected component (if applicable):
openstack-tripleo-common-7.6.1-0.20170912115321.el7ost.noarch
How reproducible:
100%
Steps to Reproduce:
1. Try to deploy an overcloud
2. Check the log in /var/log/mistral/engine.log