Updated openstack/openstack
Project: openstack/taskflow  dd5d8d9240a0a1772fb6727b28dde6ab928a49c7

Ensure that failures can be pickled

When a failure happens in a subprocess it needs to be
pickleable (and not contain a traceback, since those can
not be pickled) when being sent across the process boundary
so that the receiving process can read it and unpickle
the corresponding object.

Part of blueprint process-executor

Change-Id: I2f26faa4e02da6acf4f0840239d0b17143de8d76