Code cleanup for eventlet_utils.wait_fo_any
Code cleanup for eventlet_utils.wait_fo_any

- waiter class renamed;
- unused member removed from it.

Change-Id: Id2510211ba726d8ebe17d8a63f6a95ecb761f46e

pombredanne/taskflow-1,varunarya10/taskflow,junneyang/taskflow,jimbobhickville/taskflow,varunarya10/taskflow,jimbobhickville/taskflow,pombredanne/taskflow-1,openstack/taskflow,citrix-openstack-build/taskflow,citrix-openstack-build/taskflow,junneyang/taskflow,openstack/taskflow