dcc-ops EBS mountpoints not part of bootstrap?

[brainstorm]

The current README suggests a 250GB EBS volume but then the docker mountpoints remain on the root partition, leading to this:

649c991eaaea: Download complete
5f19f46d8cc5: Download complete
62d0f44c5410: Download complete
ERROR: write /var/lib/docker/tmp/GetImageBlob606462066: no space left on device

So I'm suggesting adding something like this in the boostrap script for now while a better ansible role is created:

sudo mkfs.ext4 /dev/xvdb
sudo mount /dev/xvdb /mnt
sudo service docker stop
sudo mv /var/lib/docker /mnt
sudo ln -sf /mnt/docker /var/lib/docker
sudo service docker start