Dockerize the entier wrapping process of building sklearn_iris example

[errordeveloper]

No description provided.

[errordeveloper]

There are probably more docs changes that would be needed, but I'm just trying to demonstrate how simple this becomes.

[ahousley]

Thanks @errordeveloper! @gsunner is reviewing.

[gsunner]

This is useful, thanks

[errordeveloper]

As @gsunner asked on Slack, I've updated this to create another directory instead modifying the existing one. I've not touched the docs, as I am not sure how you'd like to go about it, but all there is to do now is:

1. install Heml chart
2. cd examples/models/sklearn_iris_docker
3. make
4. kubectl apply -f sklearn_iris_deployment.json

I've tested it on Docker for Mac (latest versions that included Kubernetes), and it works. For other cases with a remote cluster, one would probably need to push the image, maybe adding make push_container_image is a thing to add...