This is the official OpenStack Kilo cycle release.
Implemented 34 blueprints, fixed 60 bugs.
The most important blueprints:
* "Join" flow control for direct workflows to synchronize multiple workflow branches (full and partial join patterns supported)
* Processing data collections using keyword "with-items" applicable for any workflow type
* Multitenancy support
* Actions now also have corresponding runtime objects, action executions, which allow to track workflow execution with any required granularity
* Workflow pause/resume
* Ability to kill workflows
* "pause-before" task policy (in conjunction with workflow resume feature allows to run workflows in "step-by-step" mode)
* Workflow environments
* YAQL expressions are now always defined in <% %> blocks
* Default workflow/action inp...