volume mounting kubeflow example

[ryandawsonuk]

Updates were made to examples in this repo for #604

But kubeflow main example still needs updating - https://github.com/kubeflow/example-seldon/search?q=volumeSource&unscoped_q=volumeSource

[axsaucedo]

Would the current Kubeflow example in the repo be enough to close this issue or would we want a volume mounting-specific example?

[ukclivecox]

probably can close this as there are other Seldon examples now.