erasure-code: Ceph distributed storage system

instead of Ceph - scalable distributed file system in the copyright notices

Signed-off-by: Loic Dachary <loic@dachary.org>
Merge pull request #1902 from dachary/wip-copyright-notices

erasure-code: Ceph distributed storage system

Reviewed-by: Sage Weil <sage@inktank.com>