Create and use a multiprocessing sync manager subclass
Create and use a multiprocessing sync manager subclass

Instead of accessing private variables of the manager
base class just create a subclass and more nicely expose
methods that can be used to introspect the managers state
and perform actions based on that state.

Change-Id: Ied570a25e52de94370b59d844ecdcc6d3551fd3d

jimbobhickville/taskflow,pombredanne/taskflow-1,junneyang/taskflow,openstack/taskflow,pombredanne/taskflow-1,openstack/taskflow,jimbobhickville/taskflow,junneyang/taskflow