dotcloud/docker — pull request #5977 by vbatts (2014-05-21 21:16:21+00:00)
Title: tarsum: include xattr headers in to the checksum

this is to enhance the tarsum algorithm, but _MUST_ be done in lock step
with the same for docker-registry. (PR will be cited)

Docker-DCO-1.1-Signed-off-by: Vincent Batts (github: vbatts)