COPYING: fix formatting

Signed-off-by: Sage Weil <sage@inktank.com>
COPYING: add debian-style headers

This may not be necessary here, but it makes this identical to the
debian/copyright file, which is a win.

Signed-off-by: Sage Weil <sage@inktank.com>
COPYING: add Packaging: section

Again, debian-specific, but who cares.

Signed-off-by: Sage Weil <sage@inktank.com>
debian/copyright: sync up with COPYING

Signed-off-by: Sage Weil <sage@inktank.com>
COPYING: fix URL

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #682 from ceph/wip-copying

sync up COPYING and debian/copyright