Automatically configure instance storage
Automatically configure instance storage

If an instance has NVME instance storage, automatically format and mount
the first disk. It's mounted to /var/lib/docker by default, but this can
be overridden by changing instance_storage_mount_path node pool config
item.

Signed-off-by: Alexey Ermakov <6610c7e1c26fb4c3222ac4f760cb43a9f3c01622@zalando.de>

zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws