Updated openstack/openstack
Project: openstack/taskflow  c8e7ea30ee1dda36136cb97a9b49d5bc57e1bacf

Avoid popping while another entity is iterating

To avoid 'dictionary changed size during iteration' style
of errors ensure that we acquire the job lock/condition
before popping so that we do not affect another entity that
is currently iterating over the job dictionary.

Change-Id: I353cb7289c84c06f9712391e84294bed513dca78