Bump eventlet to 0.16.1
Bump eventlet to 0.16.1

0.16.0 version is not stable, bumping to 0.16.1 as global-requirements
recommended.

stackforge/senlin,stackforge/senlin,tengqm/senlin,openstack/senlin,tengqm/senlin-container,openstack/senlin,Alzon/senlin,tengqm/senlin-container,openstack/senlin,tengqm/senlin,Alzon/senlin