Updated openstack/openstack
Project: openstack/taskflow  3ea627169767ecce8b17fa7be9e1cd51426d3469

Cleanup WBE example to be simpler to understand

This makes the example simpler to follow and understand when
it is using threads, is in one file and just uses the simpler
in-memory kombu backend by default (it can still use the file
transport if configured to use it).

Change-Id: I7fe9758e3285e7f0a610482bf26322841fb22f39