Updated openstack/openstack
Project: openstack/oslo.messaging  84d5786f1aa6c0c7571f4273c2fbf8bd9ea7b9fb
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Remove copyright from empty files

According to policy change in HACKING:
http://docs.openstack.org/developer/hacking/#openstack-licensing
empty files should no longer contain copyright notices.

Closes-Bug: #1262424
Change-Id: I22d5881537cff120ae10b2fb3141c427d621214b