Updated openstack/openstack
Project: openstack/taskflow  d444385a084695f483bf0ce14080ed33f1c19eb9

Add a timing listener that also prints the results

Instead of just recording them it can also be quite
useful (especially for debugging) to print the start
and stop timings as they occur.

Also adds an example that shows how this can be used
and an explanation of why it is useful to have this type
of capability.

Part of blueprint more-examples

Change-Id: Id2dc3f8dc9ac94e511470e39f499f325b33537ee