Can't change LocalCluster server ip.

I'm trying to change the LocalCluster server ip in order to be able to access the dashboard in a docker container but the server can't be initialized in the desired ip. This is important when using dask within a docker container since we can't really access the private network of the docker (I think), so we need to force the host in a different ip. The same happens with jupyter servers.

```
client = Client(LocalCluster(ip='0.0.0.0'))
```
For some reason the dask-scheduler is initialized in the default ip.

```
Scheduler: tcp://127.0.0.1:46239
Dashboard: http://127.0.0.1:34809/status
```
The only workaround for this is to spin up the dask-scheduler trough command line

```
dask-scheduler --host 0.0.0.0 --bokeh-port 8787
```
and then connect the client to this host

```
client = Client(address='0.0.0.0:8786')

Scheduler: tcp://0.0.0.0:8786
Dashboard: http://0.0.0.0:8787/status
```
Even though this is a viable option, I think that when dask is creating the LocalCluster server the ip variable isn't used correctly, what's make the server being created in the default ip.