The documentation for Docker 1.10.2 (API version 1.22) mentions under
the "Create a container"[1] section that `HostConfig.Binds` can be given
a "container path" which will automatically "create a new volume for the
container."

I interpreted this to mean it that the following two commands should
have the same net result:

# Create container with data volume via REST API
curl --unix-socket /var/run/docker.sock -XPOST \
http://localhost/containers/create \
-H"Content-Type: application/json" \
-d'{
"Image": "<image-id>",
...
"HostConfig": {
"Binds": [
"/some/data/volume"
]
}
}'

# Create container with data volume via CLI
docker create -v /some/data/volume <image-id> <command>

However, this turned out not the be the case, as the former would create
a mount with no source and no corresponding volume:

...
"Mounts": [
{
"Source": "",
"Destination": "/some/data/volume",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
...
"Config": {
...
"Volumes": null,
...
}

...whereas the latter would create a volume and mount it:

...
"Mounts": [
{
"Name": "9b38af46d6..."
"Source": "/var/lib/docker/volumes/9b38af46d6.../_data",
"Destination": "/some/data/volume",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
...
"Config": {
...
"Volumes": {
"/some/data/volume": {}
},
...
}

However, if you instead specify the data volume via the `Volumes` key,
then it works as expected, e.g.

curl --unix-socket /var/run/docker.sock -XPOST \
http://localhost/containers/create \
-H"Content-Type: application/json" \
-d'{
"Image": "...",
...
"Volumes": {"/some/data/volume": {}}
}'

...will create a data volume and mount it.

Thus the documentation is either incorrect, or this is a bug and the
ability to create a data volume via `HostConfig.Binds` does not
work as advertised for API version 1.22 (and likely others).

I concluded that the documentation was incorrect. Since I've only
verified this behavior for Docker 1.10.2, I updated the docs for
API versions 1.22 and 1.23, but this may apply to other versions as
well.

[1] https://docs.docker.com/engine/reference/api/docker_remote_api_v1.22/#create-a-container

Signed-off-by: Shane da Silva <shane@dasilva.io>