Empty files shouldn't contain copyright nor license

http://docs.openstack.org/developer/hacking/#openstack-licensing

Partial-Bug: #1262424
Change-Id: Ib4d35e85ed23581f4a27a1daca8664180751f6f1
Redundant size check in volume restore api

In cinder volume restore api, we do twice size check when restore volume
with a given volume uuid. It's necessary to remove the redundant check.

Change-Id: I8f240b2c0d1014d212ff56c2c9b5e193f9d552bd
Closes-Bug: #1264053
Merge "Empty files shouldn't contain copyright nor license"
Merge "Redundant size check in volume restore api"