Documentation with details on general concurrency as well as OpenStack
specific libraries.
Describes how different libraries are effectively used across different
Watcher services. This includes describing how futurist is used in the
Decision Engine and how taskflow is used in the Applier.
Finally, this documentation describes how contributors can use the
new DecisionEngineThreadpool effectively and includes examples.
https://docs.openstack.org/futurist/latest/https://docs.openstack.org/taskflow/latest/
Change-Id: Ic1cd1f3733a0e9a239c9b8d49951e1e4ece49f3a
Partially Implements: blueprint general-purpose-decision-engine-threadpool
b5f8e9a910