Updated openstack/openstack
Project: openstack/taskflow  758cc77b8d1d06b234af63f435fd7140f632219f

Add link to issue 17911

The ongoing development in upstream python may
produce a useful class that we can use in the future
to reduce this objects code; so this adds a link to
that for future reference.

Change-Id: I86baa096e113cccbb4915ad4fd6fb8cc0313e0a0