add install option to only install docker client cli

[alexandrelussier]

Only install the package to have access to the docker client CLI, this can be useful in the case of Docker-out-of-Docker by mounting the volume of the host docker engine pipe to the windows container (-v "//./pipe/docker_engine://./pipe/docker_engine").

My use case is to run docker inside a jenkins inbound-agent for pipeline automation in Kubernetes with Windows nodes.

[ghost]

All CLA requirements met.

[soroshsabz]

@cwilhit is this repo is dead? why all of PR is not review?

[soroshsabz]

I think Docker (and windows container/nano server) is very useful feature for Microsoft windows server