Updated openstack/openstack
Project: openstack/taskflow  02884174d55aa49fbf221b120fc324153529b20f

Switch to using oslo.utils and oslo.serialization

Instead of copying modules from the incubator into taskflow
we can now directly use these same modules from supported
libraries instead so this moves the usage of everything except
uuidutils which wasn't moved over to using those newly published
libraries.

Part of blueprint integrate-and-use-oslo-utils-serialization

Change-Id: I1183bda96e1ddb062d9cab91990186f0f56f0a0e