Add release notes for 1.2.0a1
Add release notes for 1.2.0a1

These will appear here:

  http://docs.openstack.org/developer/oslo.config/

Change-Id: Ib9b9e88f54a5a3c8fb0087d55b394bb0bb54caa6

citrix-openstack/build-oslo.config,tianshan/oslo.config,varunarya10/oslo.config,citrix-openstack-build/oslo.config,JioCloud/oslo.config,shad7/oslo.config,metacloud/oslo.config,magic0704/oslo.config