Updated openstack/openstack
Project: openstack/taskflow  cfd15022d23c29c8523d805a1d3f277a0a6d9cc3

Use constants for retry automatically provided kwargs

Instead of using strings use module level constants for
the automatically provided keyword arguments to the retry
revert/execution functions. This makes it easier for users
of taskflow to associate these constants with the actual
keywords, without having to resort to using raw strings
directly.

Change-Id: I739a0ad69819c3ca0d10c98966012cf9ef1b86bd