Original GH Issue: https://github.com/openshift/openshift-docs/issues/589

Enhance the following section on using arbitrary Docker images:

https://docs.openshift.com/enterprise/3.0/using_images/docker_images/overview.html

It does now at least link to the admin task about RunAsAny, but it needs more context. E.g., only a cluster-admin could even do what is being suggested. Also, it should be more up front in this "Using Images" topic about the security risks. Probably do an "include" on the following security warning, versus a passive link:

https://docs.openshift.com/enterprise/3.0/install_config/install/prerequisites.html#security-warning

We could also actually show an example of how you could now do something w/ that image if the SCC was indeed adjusted appropriately by the cluster-admin (e.g., show a walkthrough of a user grabbing an arbitrary image and getting it running in OpenShift).

Some related info in "Support Arbitrary User IDs" in https://docs.openshift.com/enterprise/3.0/creating_images/guidelines.html#openshift-specific-guidelines.