Mistral don't work with cron trigger
Mistral don't work with cron trigger

When I using mistral with cron trigger and cron was trigged,
the trigger will use trust to do something in my workflow but
mistral-executor service will emit error log:

Forbidden: You are not authorized to perform the requested
action: identity:validate_token

and i was resolved this problem with change parameter from "trust_id"
to "trusts" in function _admin_client:
https://github.com/openstack/mistral/blob/master/mistral/utils/openstack/keystone.py#L95

Change-Id: Idde5b0ed4a4b9f30e4258cd792acb270d5586087

openstack/mistral,openstack/mistral