Bump oslo.middleware to 1.2.0
Bump oslo.middleware to 1.2.0

Sync with global requirements.

Change-Id: Ie864caa748193e92b89af8bba62ab1a886fe5941

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