contrib: bump docker version
contrib: bump docker version

We need to use the lastest stable release so we can get the 'manifest'
subcommand from the CLI.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

ceph/ceph-docker,ceph/ceph-docker