Updated openstack/openstack
Project: openstack/taskflow  0e43d3e87092a8b07639faf1cf24c8283ec747a3

Add a history retry object, makes retry histories easier to use

When a retry object is asked to make a decision about the atoms
it controls it is currently provided a complex object that contains
what has failed and why and what was provided to try to resolve this
failure as raw types. To make it easier to interact with that history
provide and use a more easier to interact with helper object that
provides useful functionality built ontop of the raw types.

Part of blueprint intuitive-retries

Change-Id: I93f86552f5a0c26b269319e4de6d9b8fb3b3b219